Thanks! The Mission of Cheaper Than Dirt! All Rights Reserved. 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. I've seen that pic, it is a good reference. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. Editors Note: This article was originally published in January of 2019. 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. Please be respectful of others. Does it make a big difference? Display as a link instead, Its a miracle! ago KrinkyDink2 9 hr. We want you, our readers, to be able to make informed decisions. Is getting it as part of the upper better? In general, all you need to understand is that the M4 feed ramps include the barrel extension and upper receiver. hey bro nice to see you here!!! Whether they materialize or not depends on the direction of the mismatch. So, an M4 feed ramp includes the barrel extension and the upper. The barrel Throat is the second most critical component after angles and should be polished with utmost care. And that the M4s and M4A1s are issued M855 which has a slight difference in bullet shape vs. the older 55gr M193 BALL. Jams and misfires. Site towers are not "F" marked SPECS: Length- 14.5". upper recievers and barrels are hard to comeby. However, an M4 barrel extension is dished more so the feed ramps could extend downward, and then an area within the upper is shaped to match. Your email address will not be published. SKU: BCM-URG-M4-16 Features: M4 Feed Ramp Barrel Extension Caliber: 5.56 NATO Barrel Length: 16in Barrel Style: Standard Handguard: None BCM M4 Handguards (Double Heat Shield) - Black + $15.00 PKMR (Polymer KeyMod Rail) Carbine Length - Black + $24.95 PKMR (Polymer KeyMod Rail) Carbine Length - Flat Dark Earth + $24.95 Stock Status: Out of stock When carrying out feed ramp polishing, it is crucial to prioritize the frame's angles, which is a critical part of the feed ramp. In most cases the ramps only help during full auto mode while cycling at a high rate. Backing up a ton: Any and all AR-15 barrel extensions have feed ramps. First of Im not a gunsmith or firearms professional. Powered by Invision Community. 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. From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Full M4 feed ramps are on both the upper and barrel extension. Clear editor. Pasted as rich text. 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. I suggest you get a rifle receiver. M4 ramps help in feeding in for carbine in full auto. Either way is good and both types work great with semi auto only guns. The extension is the part at the end of the barrel that fits inside the upper. Anodized red parts. are all barrels w/ m4 feed ramps?? AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. 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. These units actually feature the NON-F-Marked (correct) front sight base. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. Most of barrel assemblies and upper receivers on the market now have a present of M4 feed ramps. The M4 receiver feed ramps are cut at a steeper angle and, as a result, extend down into the receiver wall. 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. Copyright 1996-2023 AR15.COM LLC. My experience with ARs is all A-1s. Rear side of a CZ-75B pistol barrel showing the (here dirty) feed ramp. 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 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. I had seen these pix years ago and dismissed the idea of mix and match. I've been thinking about doing sort of an "Early Diemaco C8 carbine" clone build with a C7 style upper receiver. When I function tested it the first time with live half-jacketed rounds I had the worst FTF jam I have ever experienced. CARBON-15 Stripped Lower Receiver A feed ramp is a basic feature of many breech loading cartridge firearm designs. You have the option of barrel type, thread, fluting, finish type and to add a match bolt. BUT if you find someone to grind your feed ramps and they do a good job, post it up and let us know. 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. 2. The ramp angles are different and changing the profile of the extension doesn't make it something it isn't. Everything that you have on your side to make any weapons more reliable and work when it absolutely needs to is a plus. Notice how the ramp starts on the barrel extension and not in the receiver. For a better experience, please enable JavaScript in your browser before proceeding. I'm planning on replacing my forearm with a Larue 13.5. I've modified barrel/receivers even before M4 cuts came out and done some receivers when the barrels had cuts. Copyright 1996-2023 AR15.COM LLC. Don't ever put non M4 ramped barrel on a M4 ramped upper receiver. 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. However the DD 14.5 are ideally meant to mate up with M4 style upper receiver feedramps. I have done the same, protect the Barrel extension with a layer of electrical tape and carefully file or Dremel the ramps into the aluminum receiver. I just need a little guidance on this and I'm having trouble getting good results from Google. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. The manufacturer said they had sold hundreds of barrels with out problems reported. 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. Does NOT include pin This 20" BCM barrel is machined from SS410 stainless steel. Costs about $40-50 to have the feed ramps reprofiled from what I can gather. Share it in the comments section. Your link has been automatically embedded. I notice that's a Gibbz (or Gibbz-type) upper. Higher pressure equte to parts (bcg, buffer, buffer spring, ROUNDS, etc) experiencing much higher wear/tear. Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. 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. AR9 - Help diagnosing feeding issue. I have a non ramped barrel in a ramped upper, feeds fine. As they are becoming more and more a standard, and certainly do not do any harm to us. Amazing what happens in a thread over a simple question. Edited April 27, 2014 by Mark Gale For instance I was looking at the BCM upper receiver, and it said it had M4 feed ramps machined into the upper. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Snipers Hide is a community of Snipers of all kinds, focusing on long range shooting, accuracy, and ballistics. There is a picture of the various options, hopefully another poster can link them. Load a magazine with two or three rounds, lock the bolt group back on your rifle or carbine and insert the magazine. Finding the proper upper receiver is your best option. Ballistic Performance of Federal Punch .22 LR Ammunition with the Heritage Barkeep #1063. Other selections are available for upper, bolt and carrier, charging handle, handguards, flash hiders, and gas blocks. The information provided here does not represent the views of Cheaper Than Dirt! For someone who is new at trying to understand feed ramps it helps to read a couple different explanations. Just put it in and shoot it. I picked up a side charging upper from Sundevil last year. By using the M4 feed ramps for your firearm, you could pick up an increased percentage of the rounds, and feeding reliability would be improved. They offer a lower, more extensive, and smoother entry for any round of ammo, whether its necessary or not. Add 3% to the total cost for credit card purchases. I'd rather not spent the money to get it cut to the specific length I need, FSB installed, etc just to have it immediately not work and have to sort out then or start from square one with a new barrel. Paste as plain text instead, If I was concerned with precision, I would seek out parts from well-known gun makers and customizers Baer comes to mind, Hart barrels, etc etc. Read Now. Description. The barrel blanks available are made from 416 Stainless Steel. I'm a machinist in the aerospace industry and lucky enough to have. If it was some flat top + 16" FSB barrel id just swap upper/barrel, but this is a little more challenging to do that with. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. It was in the last few issues of SAR. Damaged Ak front end Barrel in Trunnion with or without sight bases. The reason I decided to write about this topic at all was because there are some mil-spec features advertised on aftermarket parts that arent even really mil-spec. 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. The Bullet ~ Handguns, Rifles and Shotguns, http://thearguys.com/ar-facts/m4-feed-ramps/. They provide a lower, wider, and smoother entry for any round of ammo, whether its necessary or not. 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 (theyre lowered). which is basicallly an m16a1 cut down. Also, barrel life is relative. They guide the bullet up and into the chamber. I have looked and looked and looked. A couple of times I ended up with the OK set up from the picture above. You will be able to leave a comment after signing in, AR15Armory.com Barrel, sight and trigger work on most pistols and shotguns. Barrel customizations are also available. 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. You wrote that much to make a point that should have taken about 100 words? I bought a .458 upper to go with it, with the extra internal clearance cut before anodizing. Can I use a barrel with M4 feed ramps with an upper that isnt M4 matched? M4 Feed ramps on barrel extensions are a solid example. FFL Fax: 866-721-8691. 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. The magazine lips cannot move, so with these larger diameter cartridges, the bullet tips down lower about the centerline of the bore (half of the diameter increase to be exact). I recently built an AR9 (Glock Mags) that has been running flawlessly for about 3-400rds. This USGI modification was done to both the barrel extension and the upper receiver, creating a longer and steeper feed ramp. FN AR-15 5.56X45mm Nato . . Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. M4 feed ramps will extend the barrel extension and the upper receiver. Another reason is that any commercial receiver and parts makers want to tool up to make upper receivers and barrel extensions, especially when shorter guns are becoming more popular. M4 feed ramps are not an original design, they were designed for the M4 In fact, the . The M4, and the CAR-15, before it have had similar problems like the ones you mentioned. Experts advise on 31 degrees+30 minus-zip. Married pretty well with my Seekins machined lower. Get The Best Trigger Pull Gauges To Make Every Shot Count. The angle is going to be key, alot of people attempt to mimic the angle of the barrel feed ramps, this is incorrect. I can still use the combination. It's an interesting question. It has 2 ramps cut into the receiver to help the rounds feed into the chamber. Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? so im thinking I might as well just get the unramp upper. I checked what I have now. The ramps on the regular rifle-type extension are cut just to the edge of the extension. You CAN modify a rifle/A2 barrel extension to an M4 style extension, but it isn't always the best way to go unless you just have to do it. Change the angle so that the ramp ends at the exact same point. This gave it a longer point for the magazine to allow the rounds to come out of the magazine and feed into the chamber. M4 16", SBN, 1:7, 5.56 NATO Barrel Specifications: - Caliber: 5.56 NATO (.223 REM) - Gas Tube: Car Add to Cart. What is the difference between Modern, Performance, and Premium Series Barrels? 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. You can post now and register later. Gun smith said , not head spaced properly. This has been my concern with modifying the aluminum parts. i have the rifle barrel. How long your barrel "lasts" depends on what your accuracy threshold is before you decide it is too bad to keep using. So I'm working on my first build, and I'm a little confused. I've seen uppers with and without anodizing on M4 ramps . it seems to me to be about 50/50 with and without. All Rights Reserved. What is an m4 feed ramp? Earlfillmore 13 hr. I'm lookin for a clear definition as to what they are, and what they do to enhance a given rifle's performance? Im an old vet, now retired and looking to build some ARs as a hobby to keep me doing something that I will enjoy. Description Genuine 14.5" SOCOM, carbine length gas system barrel from Colt. You also repeated yourself. http://www.ar15fornoobs.com/wp-content/uploads/feedramps.jpg. Is it kosher to add M4 feed ramps to a standard upper to match an m4 ramped barrel? 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). which is bad combo. With the increased use of larger-diameter cased cartridges, the M4 feed ramps are proving their values when using them in those cartridges. If you have an account, sign in now to post with your account. It is milled out of 6061 T6. Upload or insert images from URL. It's best to use rifle/rifle combo or M4/M4. 's blog. By I should have taken my own advice for once. This space is for pictures of "retro" Stoner rifles and completed or partial retro AR-15 builds, as well as discussions about either. It may not display this or other websites correctly. I replaced the M4 feed ramp barrel with a monolithic feed ramp barrel and no more problems. You can run M4 cut barrels with rifle receivers, but not the other way around as it will create at catch that can hang up the bullets. Your previous content has been restored. By the time you made it work you spent more time, money, and effort than if you just bought a new barrel or upper. 30 cal. However Ive built numerous ar15 and lr308 rifles and pistols. Guess what? A4 Complete Upper Receiver. 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. Will my A3 upper reciever work with my M4 barrel extention.According to some or your posts they will.Thanks Bill. Good call. Please allow 5~10 days for assembly and testing before ship date. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. All Rights Reserved. #2. What's the difference? FWIW one of my rifles has M4 feed ramps on the barrel and no M4 feed ramps on the upper and it has functioned just fine. -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! 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. colt A1E1 733 uppers didn't have extended carbine feedramps ? Product Description Surplus Colt 14.5" SOCOM, carbine length gas system barrel from Colt. 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? If your upper isn't showing signs of bullets rubbing on the aluminum under the barrel extension, you should be good with M4 ramps. All comments are held for moderation and will appear after approval. I'd rather just pay the gunsmith to make it work than hunt down another barrel/upper if possible. 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. I recommend putting any AR-platform firearm together with a matched M4 barrel extension and upper receiver set, just because you can. 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. Installing a Luth-AR Rifle Buffer Tube and an A2 Stock #1041. Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. It's going to a gunsmith to be shortened and rethreaded anyways, can they just grind/polish the feed ramps to match or is it more involved than that? Reliability is the main concern for me when I re-barrel this rifle. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. Olympic Arms Upper receiver with rear sight assembly and forward assist and dust cover has M4 feed ramps $260 View attachment 1016575 View attachment 1016576 i have an extra brand new M4 barrel extension ramp to replace a rifle ramp. I like all my guns to be reliable. However, its rare now to find an upper receiver or a ready-to-go barrel that doesnt have the M4 cuts. Ok, So, in short, I've got a barrel on my Armalite upper (with M4 feed ramps in the upper) that has standard AR-15 (non-M4) ramps. Here's some info from Randall Rauch aka www.ar15barrels.com, if your barrel extension has M4 ramps you should have an upper receiver also with the ramps. Thats true overall and good to keep in mind. No feed ramps. For a better experience, please enable JavaScript in your browser before proceeding. 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. Thanks for explaining the feed ramp topic in a couple of different ways. Powered by Invision Community, M4-style barrel extension with Rifle-type upper. [ARCHIVED THREAD] - M4 feed ramp barrel in a non M4 ramp upper. You must log in or register to reply here. I have a 723 build (w/ C7 upper) and a 727 build (A2 upper) that use 14.5" Colt M4 barrels. I use it for hunting dogs only. So I called. if you are OK with 3MOA, you might go 20,000 rounds! "C" stamp and CAGE code available. Instead, I just loaded up each mag with two rounds, and pushed the rounds forward by hand until the tip of . Would not feed to save its life! The M4 style feed ramps and barrel extension provide consistent feeding and the matte black Manganese Phosphate finish resists external corrosion and oxidation. Issues can arise when receivers and barrel extensions are mismatched. That puts the cartridge in a position where the extended feed ramp improves the breech-loading design. Barrels are Douglas 416 stainless steel with 1-7 twist with M4 feed ramps Press J to jump to the feed. Some barrels I see for sale say they include M4 feed ramps, and some uppers say they include them too. I wont buy a barrel that isnt a wylde 223 556 but Im only now noticing. Press question mark to learn the rest of the keyboard shortcuts. For this test, I used a Colt upper with M4 feed ramps and a SOCOM heavy 14.5 barrel, just like what is used in the military. Dec 17, 2020. We have four combinations here: *Must have a registered ARFCOM account to win. /r/ar15 is here for your favorite black gun links, build pics, questions and other tactical or practical information. Seems like it should work to me, but be a real challenge to keep clean and be damned ugly to boot. I guess it depends on what your relationship to the necessary shop activities is. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. is the m4 feedramp common in barrel extensions? The M-16/M4 are great weapons. You want them to match. 3. 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.