adding m4 feed ramps to barrel
3. It's an interesting question. This is why you can use a barrel with an extension with M4 feedramps with a receiver that does not have feedramps, but you cannot use a receiver with M4 feedramps with a barrel with an extension with rifle feedramps. M4 Barrel Extension (M4 Feedramps) $22.95 (4 reviews) SKU: Barrel-Extension-M4 Stock Status: Quantity: Add to Wish List Description For your AR15, M16, M4. AAC and anybody else that has any reasonable expectation of quality and reliability use an M4 feed ramp. Inadequate knowledge about these feed ramps can lead to lots of problems with barrels because they are essential parts to guide the bullet up and into the chamber. Thanks. Personally, I would sell the rifle upper and buy an M4 upper - the cost will be small and you will end up with a more satisfactory end product. I'm a machinist in the aerospace industry and lucky enough to have unrestricted access to a really nice machine shop so the modification from rifle to M4 feed ramps is no sweat, I've done it once before a few years back with a .250" carbide cutter in the mill for a friend and it came out looking indistinguishable from a true M4 extension. If your mag catch is at Spec height, you should not have a problem with an M4 cut barrel in a rifle receiver. So, an M4 feed ramp includes the barrel extension and the upper. They are better! UPPER RECEIVER: AR-15 Mil-Spec Machined out of 7075-T6 Forged Aluminum, M4 Feed Ramps, Cerakoted Magpul Flat Dark Earth (FDE) Color with Forward Assist and Ejection Port Cover Installed BARREL: 22 inch, 223 Wylde Caliber, 4150 CMV, 1:7 Twist, Heavy Bull Barrel Profile, Straight Fluted, Melonite/Nitride Finish - made for us by Tactical Kinetics HAND So, what is the difference between M4 feed ramps and regular ones? Brevity matters. Seems counter intuitive to recommend an M4 cut upper, especially if the barrel Im looking at has the rifle feed ramp (not M4 cut). Don't ever put non M4 ramped barrel on a M4 ramped upper receiver. I can still use the combination. Gun smith said , not head spaced properly. This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. Please allow 5~10 days for assembly and testing before ship date. hey bro nice to see you here!!! Sorta. Earlfillmore 13 hr. The upper is designed to have two levels of top rails for mounting of night vision in front of scopes. Barrel, sight and trigger work on most pistols and shotguns. - The Shooter's Log, 2012 SHOT Show Special Report: Daniel Defense DDM4 V5 in .300 Blackout and a Factory SBR - The Shooter's Log, 2012 SHOT Show Special Report: SOG Armory Predator Rifle - The Shooter's Log, Surefire's 100-Round MAG5-100: The Highest Capacity AR-15 Magazine - The Shooter's Log, Throwback Thursday: Taurus Judge Range Report, ATI Milsport SGA 410 All the Advantages of an AR in .410, Ruger SR1911 LW Commander The Lightweight .45 ACP, Rifle Hack: Sighting for 100 Yards at a Distance of 25 Yards, Throwback Thursday: All About Bullet Grain. Would not feed to save its life! ago KrinkyDink2 9 hr. Does NOT include pin Moreover, telling someone that an extension can be modified, while not a lie, is nothing more than mental masturbation when your post contains a caveat for having the knowledge and proper tools. This includes M4 feed ramps, barrel nut, front sight tower and sight post, and -28 threads for a muzzle device. Some suggest taking a grinder to the extension area. In short, if you have a Dremmel you can do it yourself. Single Action and Double Action Which One Is Better For You? If a barrel comes with the feed ramps could I take them off? Seems M4 is all the rage these days. I would just make sure to order rifle upper with rifle barrel extension or M4 upper with M4 barrel extension. With a larger diameter case body sitting down in the magazine, the tip of the bullet sits lower in relation to the chamber/bore centerline than with a .223-size round. However, I have seen more than a few basement gunsmith hackjobs using a dremel, some Jack Daniels/liquid courage, and an unsteady hand that have made a total, unrepairable mess of the job. Ar-15 Manufacturers Should Be Avoided: Which Should You Buy? If you don't clean it but demand 3/4MOA you might get 1,500. A4 Complete Upper Receiver - 7075 Forged A4 Flat Top Upper Receiver - M4 Feed Ramps Includes: - Add to Cart. Can someone recommend or point me in the right direction of a good quality upper receiver for an SPR build that does not have M4 feed ramp cuts in it? Insert the barrel and sharpie the cut area, then use the right bit on a dremel. A closer look at uppers and barrel extensions. All this basically means is that the ramps continue from the barrel extension down through the upper receiver tonthe magazine. The manufacturer said they had sold hundreds of barrels with out problems reported. Seems like it should work to me, but be a real challenge to keep clean and be damned ugly to boot. Can I use a barrel with M4 feed ramps with an upper that isnt M4 matched? Feed ramps on barrel extensions are a good example. You need to match up barrels to receivers for optimum performance. M4 can better explain their benefit, although they help with more reliable feeding. Its easier to add feed ramps to the receiver not so easy to add them to the barrel extension. The angle is going to be key, alot of people attempt to mimic the angle of the barrel feed ramps, this is incorrect. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. Barrel is medium SPR profiled barrel, threaded with a 1/2-28 thread for the AE brakes and collar. M4 Feed ramps on barrel extensions are a solid example. It is removeable with a special wrench and a barrel clamp/vise. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Ready to drop onto a complete lower receiver. Get The Best Trigger Pull Gauges To Make Every Shot Count. Little polish. On AR9's, I understand the distance between the Mag Follower and the Feed Ramp is a known complication in the design. Now, theres nothing wrong at all with a little polish on any and all feed ramps, which can not only be done fairly easily, it can be successfully done by most at home. The photo shows the dents and the bolt lugs line up perfectly. AR9 - Help diagnosing feeding issue. Powered by Invision Community, M4-style barrel extension with Rifle-type upper. I'd rather just pay the gunsmith to make it work than hunt down another barrel/upper if possible. Not saying a really good gunsmith cant do it, just that theres a bit of an involved process. Reliability is the main concern for me when I re-barrel this rifle. I'll probably build a pistol out of this one. I read in Bravo company that there are 2 kinds of flat top upper. Should not be too hard. You can post now and register later. check out the. For new construction barrels only. Its also recommended you polish the ramps once youve achieved the appropriate angle. In most cases the ramps only help during full auto mode while cycling at a high rate. If you have a bolt that you would like to use you are welcome to ship it to us for accurate headspace. A couple of times I ended up with the OK set up from the picture above. If it's happening regularly, check the magazines you are using for serviceability. However Ive built numerous ar15 and lr308 rifles and pistols. The Fora platform includes forum software by XenForo. so it is better to have an upper reciever that's designed for non-m4 feed ramps since you can put in standard barrels right? Those ramps line up with the barrel, which are cut deeper than on a rifle barrel. Ballistic Performance of Federal Punch .22 LR Ammunition with the Heritage Barkeep #1063. Issues can arise when receivers and barrel extensions are mismatched. Well, over the course of 5,000 rounds at .40 a round, you spent two grand on ammo. Good call. FFL Fax: 866-721-8691. This has been my concern with modifying the aluminum parts. Rifles, Uppers, Lowers, Barrels, and more, [ARCHIVED THREAD] - Rifle vs m4 feed ramps, http://i135.photobucket.com/albums/q125/PursuitSS/Postings%20photos/c0d26170b75c3e6f9ea65a7d0862247e.jpg. An upper without feed ramps can be used with a barrel that has them as the majority of the ramp is on the barrel extension. We're a little past that point as I already own both the barrel and receiver, both of which cant easily be replaced or swapped for a decent price. This space is for pictures of "retro" Stoner rifles and completed or partial retro AR-15 builds, as well as discussions about either. The information provided here does not represent the views of Cheaper Than Dirt! However, its rare now to find an upper receiver or a ready-to-go barrel that doesnt have the M4 cuts. True, which is why they're not even needed in semi autos. Shorter length equates to much higher pressure in the upper receiver. This USGI modification was done to both the barrel extension and the upper receiver, creating a longer and steeper feed ramp. All Rights Reserved. Any body need a anchor for a very small boat? The Mission of Cheaper Than Dirt! Product Details Douglas 18" Flat Dark Earth Cerakoted 416 stainless steel barrel with 1-7 twist and M4 feed ramps. so im thinking I might as well just get the unramp upper. By my estimates, the tip of the bullet first hits the barrel extension about 1/3 of the way up the respective feed ramp on the barrel extension. Having been in military supply, I know that what the mil-spec means: it gets the minimum job done for thousands (millions) of parts/systems. I too built a .458 SOCOM carbine . Avoid Polishing Too Lightly Or Too Roughly If your magazines are set up correctly, and the feed lip edges polished smooth, each round fed from the magazine will go directly into the chamber. Press question mark to learn the rest of the keyboard shortcuts. Is getting it as part of the upper better? We want you, our readers, to be able to make informed decisions. The parts are interchangeable. Looking to spend $180-250 (depending on condition, forge mark and if a rear sight is included or not.) If I can correct an issue before it's an issue that is preferred. And that the M4s and M4A1s are issued M855 which has a slight difference in bullet shape vs. the older 55gr M193 BALL. There is a picture of the various options, hopefully another poster can link them. I have seen it done many, MANY times and if done right, it works/functions 100% without issue. 308 m5 using m4 feed ramps, which I belive are for the smaller round like. Recommend using a gunsmith this route too if you are not comfortable. May 17, 2008 in The Armorer. Remember less is more, little by little. I can probably get the upper reciever first. So, what youre saying is that an M16 upper (not M4 cut) will work with either barrel, but an M4 cut upper will only work with an M4 cut barrel. You can modify the upper, but bear in mind that the un-anodized aluminum surface will be very soft and prone to wear if your particular bullet hits it frequently. An older-version (or A2-style) feed ramp is cut only on the barrel extension itself (top). The barrel Throat is the second most critical component after angles and should be polished with utmost care. All comments are held for moderation and will appear after approval. . The barrel extension and the receiver both have to have the cuts. Try this little exercise: 1. Bullets tend to bump, snag, and stub on these guns. Full M4 feed ramps are on both the upper and barrel extension. I have a 723 build (w/ C7 upper) and a 727 build (A2 upper) that use 14.5" Colt M4 barrels. My factory JP CTR-02 has the appearance of the bottom right picture in the post above, M4 barrel extension in a rifle receiver, and there is not a mark on the aluminum under the barrel extension. Either way is good and both types work great with semi auto only guns. Its not a big deal but still an important thing to remember and understand. There's a 7 degree difference between standard and M4 ramps. 2. Reach in through the ejection port and slide the on deck cartridge about 1/4 inch forward and observe the tip of the bullet in relationship to the barrel extension. M4 feed ramps were created during the development of the xM4 carbine for the original Army requirement of a carbine rifle that used the then current M16A2 upper receiver, 14.5" Barrel and had featured a collapsible sliding stock. From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. colt A1E1 733 uppers didn't have extended carbine feedramps ? Thats why AR10s- And Scar heavies exist for. I've seen uppers with and without anodizing on M4 ramps . it seems to me to be about 50/50 with and without. The best case is to have both an upper and barrel that have the feed ramps. $101.95. BUT, I DO NOT TRUST MY LIFE TO THAT WEAPON. upper recievers and barrels are hard to comeby. The rifle-platform M16s dont use them. Since the M4 barrel is one and a half inches shorter than the minimum legal barrel you can install in an AR15, the M4 gas tube will be, of course, smaller. These Mil-Spec M4 feed ramps are part of the original CNC manufacturing process. The best case is to have both an upper and barrel that have the feed ramps. Your discussions, feedback and comments are welcome here as long as they are relevant and insightful. I'm lookin for a clear definition as to what they are, and what they do to enhance a given rifle's performance? In military situations, it is advantageous for rifles to function with damaged, worn, or less than ideally serviceable magazines. Given that most of us dont always have perfect access to truly genuine Mil-Spec, mil-standard parts (those actually used in issued fighting tools), were shopping based on a little part trust and a bigger part knowledge. If your upper isn't showing signs of bullets rubbing on the aluminum under the barrel extension, you should be good with M4 ramps. Sent back again. They aid in feeding the round into the chamber from the magazine more easily, which make uppers and barrel extension matched. I built the upper using a Mega upper with a Compass Lake 18" barrel. I wouldn't be concerned at all with any wear after modifying an upper receiver. By the time you made it work you spent more time, money, and effort than if you just bought a new barrel or upper. Pasted as rich text. M4 extension with .350 M4 style feed ramps 11 Degree Target Crown Threaded Muzzle 5/8"x24 TPI Weight: 26.5 ounces I think your mistaking that with adding ramps to the receiver. Theres a bit more to it than just polishing. Some gun owners believe that the M4 ramps can help for some of the larger-diameter cartridges in use. can the barrel extension be bought individualy? The M4 cut extends down beyond the edge of the barrel extension (has a scalloped appearance), and a correspondingly deeper cut in an M4-spec upper receiver effectively extends the ramps downward (they're lowered). Your email address will not be published. I didn't forsee that we'd ever see the day when replacement parts would be so hard to get. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. - The Shooter's Log, 2012 SHOT Show Special Report: Del-Ton TRX Rifle and More! You also repeated yourself. Don't forget read more information about it here! Semi autos run slower than full autos. All NFA rules apply. The difference between standard feed ramps and M4 ramps is easy to see. They . Previous. Product Description Surplus Colt 14.5" SOCOM, carbine length gas system barrel from Colt. In case My barrel is rifle ramp it won't be so bad after all. Thats true overall and good to keep in mind. One of the AR15 engineers under Gene Stoner pretty much said that the M4 isn't a good platform, especially once the gas port erodes a bit. Forged 7075-T6 aluminum is harder than a bulls balls. I like getting another Upper idea then you could end up with two rifles! I got my help from this thread, and thank you again to ORD. The ramp angles are different and changing the profile of the extension doesn't make it something it isn't. After two months of back and forth, cleaned up the feed ramps. The only one I found is LaRue's upper, but it won't work with the hand guard I'm using (Geissele MKIII). http://www.ar15fornoobs.com/wp-content/uploads/feedramps.jpg. *Must have a registered ARFCOM account to win. Barrels are Douglas 416 stainless steel with 1-7 twist with M4 feed ramps Bear Creek Arsenal Barrels - 6.5 Grendel Type 2 Barrel This Gorilla Machining AR-15 16" heavy Black Nitride 6.5 Grendel barrel has a Carbine length gas system with a 1:8 twist. Questions on how to install your new BA barrel? Does anyone have a follow up that confirms or denies my claim? I suggest you get a rifle receiver. All Rights Reserved. You absolutely do not want it the other way around however. The M4 ramps, if I am not mistaken, were originally made to help reduce malfunctions on the M4 carbine. #2. I've thought about it myself, and I'd like to see test results if any exist, displaying what reliability effect M4 ramps have on other barrel lengths. Being a Newbie AR owner ((Ive been an avid gun owner for nearly 50 years), I appreciate the information and visual aids that Im sure will be a big help in enjoying and using this gun platform. If I have a rifle ramp upper and get the barrel later and coincidentally will have an m4 ramp. There is no way to make a carbine barrel extension out of a rifle barrel extension, period, full stop. I think my question would be why rifle receiver+M4 barrel is just "ok" rather than "good", unless the point is that in a carbine-gas gun M4 ramps are just considered an improvement over no ramps. M16s and M16-A1s run at 750 rounds per minute in full auto. Man, its crazy how many of yall have absolutely no idea why you do what you do. Full M4 feed ramps start on the upper and continue onto the barrel extension. Please be respectful of others. 5. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Watch a video about our Modern Series AR barrel: By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. So I'm thinking I ought to have M4 ramps in the gun because based on what I've read: Rifle receiver+M4 barrel = "OK" but not ideal. Our 6mm ARC barrel come standard with 1-7.5 Twist, M4 Feed Ramps and gas tube. This 20" BCM barrel is machined from SS410 stainless steel. M4 ramps help in feeding in for carbine in full auto. [ARCHIVED THREAD] - M4 feed ramp barrel in a non M4 ramp upper. Some barrels I see for sale say they include M4 feed ramps, and some uppers say they include them too. Looking For Bear Creek Arsenal Barrels Review? what does it do?? You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers. Supposedly you'll only notice issues with rapid/auto fire with a configuration like this. Factory said its fine . I like all my guns to be reliable. Required fields are marked *. It's not worth changing the barrel extension on an already finished barrel, getting the new barrel extension to line up correctly with the gas port will probably cost more in gunsmithing/machining fees than buying a new barrel. . The last is using the best and right ammo for the job. Looking for a black stripped A1 upper with non m4 feed ramps (just realized the upper I have wont work with my barrel). I should have taken my own advice for once. 2. "A Bad Day At The Range Is Better Than A Great Day Working". Oh well, as I tell my lovely and understanding bride, guns are relatively free. it's the ammo and training that cost real money. "C" stamp and CAGE code available. Also, barrel life is relative. "It will last 5k rounds instead of 4k. i have the rifle barrel. You wrote that much to make a point that should have taken about 100 words? Damaged Ak front end Barrel in Trunnion with or without sight bases. On the other hand, I wouldn't consider them as a deal breaker, and they would not pass up a good deal with an upper only because it did not have them - the M4 feed ramps. Buy AR 15 16" .350 Legend Nitride M4 Profile Barrel 1:16: GunBroker is the largest seller of AR15 Parts Gun Parts All: 974000728 . Some, me included, have said that the M4 ramps are a help to some of the larger-diameter cartridges in use, such as 6.5 Grendel or .22 Nosler. Proper maintenance and lubrication. Display as a link instead, I am glad to know that I need to look for changes in design and the differences in the A2 and A4 feed ramp / rails. well.. it's kinda hard to get stuff in this part of the world. If you want precision, dont look to the mil-spec gun, look to the one that is popular in 3-gun competitions, at Thunder Ranch, etc. 50 bucks one way or the other on the barrel ain't squat! JavaScript is disabled. As a result, the factory machined M4 feed ramps on the receiver are hard coat anodized which adds significant strength to the aluminum. This Kit is made to cut or polish the STEEL Feed Ramps on your Barrel Extension ONLY. The closest brand new barrel you are likely to find is the Windham Weaponry 20 inch 1/7 twist chrome lined barrel. We have four combinations here: From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. You can always buy a non-m4 extension and have the new barrel retimed and headspaced, but it will probably cost more than a new upper receiver. It was in the last few issues of SAR. The barrel blanks available are made from 416 Stainless Steel. Lol. Modern Series Barrels. For those who have actually done it will a new barrel with the M4 feed ramp extension function properly with an old school rifle-type upper receiver? The Shooter's Log, is to provide informationnot opinionsto our customers and the shooting community. If you have a m4 ramped upper but not barrel you can cause problems as there's a lip of steel barrel extension in the way that can cause feeding problems. Gas block area is .750 diameter. I don't quite trust myself to give it a go, but if that's all there is to it I'm hoping they can do it for a reasonable price. Add M4 cuts to Barrel Ext $15.00 We can modify your rifle extension to match the M4 cuts in an upper receiver. Not all mil-spec features advertised on the product information are the real mil-specs. Machined from 4150 Chrome Moly Vanadium Steel and feature a QPQ corrosion resistant finish and QPQ coated M4 feed ramp extension. Costs about $40-50 to have the feed ramps reprofiled from what I can gather. Went back to the sellers website and found I was not the only one with problems. pm me at BOG or PG, or get in touch with my number 09177542777 if you're interested. practical_man It's not worth changing the barrel extension on an already finished barrel, getting the new barrel extension to line up correctly with the gas port will probably cost more in gunsmithing/machining fees than buying a new barrel. I'm planning on replacing my forearm with a Larue 13.5. I'd get jams from bullets hitting the back of the upper so I took a small round file and made the M4 ramps in the upper. Feedramps, proper staking of castle nuts, forward assist (yep went there)S-happens seen it. Site towers are not "F" marked SPECS: Length- 14.5". I recommend putting any AR-platform firearm together with a matched M4 barrel extension and upper receiver set, just because you can. For a better experience, please enable JavaScript in your browser before proceeding. The tip of the cartridge rarely comes into contact with the upper receiver. You will be able to leave a comment after signing in, AR15Armory.com Absolutely nothing to do with casing diameter, or whatever other weird sht you guys imagine. . I use it for hunting dogs only. That is what I tell people when they try to convince me that they need a stainless barrel instead of chrome-moly. The extension is the part at the end of the barrel that fits inside the upper. Mil-spec is good for the masses, and if you want the job done it is a great start. For use by barrel manufacturers. By Yamil Sued August 6, 2021. BEFORE YOU GO MODIFYING IT, check your headspace.I have a Gibbz upper in my junk drawer because the upper -- for some reason -- wouldn't allow a perfectly good bolt (as checked by Criterion) to headspace correctly on a Criterion barrel, with the bolt installed in the carrier. M4A1s run at 950 rounds per minute in full auto and even 950+ rounds per minute as the gas port erodes open bigger and bigger with wear and allows them to run even faster and much more violent. I will check with compass lake. Use this M4 Barrel extention with M4 feedramps. When I function tested it the first time with live half-jacketed rounds I had the worst FTF jam I have ever experienced. Create an account to follow your favorite communities and start taking part in conversations. which is basicallly an m16a1 cut down. Founded by Frank Galli in 2000, Snipers Hide has been offering informational videos, podcasts, and other support to its users in one location. Then you can get a regular rifle barrel for the upper with no ramps. But, as with anything else, this work can go too far. If you have an account, sign in now to post with your account. which is bad combo. The M-16/M4 are great weapons. There are several, but Steve and the guys at ADCO in OH are one such option (they use the Dremel method, but they do it right as I have seen several first-hand examples of their work and its performance after the fact). It has ran flawlessly (barring tuning of the gasblock when new) with several different brands of magazines and ammo. Just because you can, doesn't mean you should. Powered by Invision Community. this is the barrel designed and profiled for the Mark 12 Mod 0 uppers and rifles. Any use of this content without express written consent is prohibited. Your link has been automatically embedded. Most work performed while-you-wait, evening and saturday appointments available. I've shot a good deal of rounds through 20" A2's and I realize they run but you are describing issues that the M4 feed ramps alleviate, that would probably be good to reduce on A2's as well. Barrel customizations are also available. I replaced the M4 feed ramp barrel with a monolithic feed ramp barrel and no more problems. That's an important thing since without the feed ramps, issues can arise when receivers and barrel extensions are mismatched. An upper without feed ramps can be used with a barrel that has them as the majority of the ramp is on the barrel extension. AR Tech Tip - Checking M4 Ramps for overhang School of the American Rifle 84.8K subscribers Subscribe 2.9K 90K views 2 years ago AR Tech Tip - Checking M4 Ramps for overhang Show more Show more. JavaScript is disabled. Contents: 1 Diamond Burr (For Colt 2 Stage Ramps) 1 Cut Lube (For Diamond Burr) 1 Bullet Stone (For Reshaping . Backing up a ton: The ramps on regular barrel extension are cut just to the edges, while the M4 feed ramps have deeper cuts in the M4-spec upper receiver. Again, youll find plenty of videos on spooling up hand grinders to remedy feed ramp and ejection port issues with these larger cartridges, but I strongly suggest going factory-done aftermarket. A forum community dedicated to drag racing drivers and enthusiasts. April 23, 2014 in Rifle - Technical. EDIT: Okay, I understand now! All uppers are assembled cleaned and tested before shipping. I found the article very informative. The good idea is that the round, presented at a lower plane, will contact other lower feed ramps and go right on in. It is a tightly machined and polished piece of metal which guides a cartridge from the top of the magazine into the firing chamber of the barrel. Load a magazine with two or three rounds, lock the bolt group back on your rifle or carbine and insert the magazine. Snipers Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. -The Barrel MUST be removed from the Upper Receiver in order to use this Kit.-Never cut or polish the aluminum M4 Feed Ramps in your upper receiver! Everything that you have on your side to make any weapons more reliable and work when it absolutely needs to is a plus. It gives a longer ramp that is less steep into the chamber. When you need to nail something you use a hammer not a wrench. Create an account to follow your favorite communities and start taking part in conversations. Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. You are using an out of date browser. Most of barrel assemblies and upper receivers on the market now have a present of M4 feed ramps. While this gun is a more of novelty build than a "serious use" AR, I intend to use good parts and want it to run as well as my other ARs. Was sort of worried about how it would run with an 11.5" barrel and mismatched ramps, but it sounds like it should be good to go either way. Feeds flawlessly. M4 feed ramps are not an original design, they were designed for the M4 In fact, the . from my service in the 70s to my personal weapons, all of my ARs are early 1970 slab sided Colt SP1s. I was planning on using a Daniel Defense 14.5 pencil barrel, because like the C8 they are CHF, lightweight profile, and .750 at the FSB (And also because quality carbine pencil barrels with .625 gas blocks seem to be in short supplyor else I'd just build a 723 clone.) .