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Paste as plain text instead, True, which is why they're not even needed in semi autos. Id just get one for that barrel and find a barrel with m4 extension for the upper you already have. The barrel is supposed to have the M4 feed ramps. 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. The information provided here does not represent the views of Cheaper Than Dirt! A forum community dedicated to drag racing drivers and enthusiasts. April 23, 2014 in Rifle - Technical. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. I can assure you that most mods that deviate from the original design aren't 100% reliable. AAC and anybody else that has any reasonable expectation of quality and reliability use an M4 feed ramp. The barrel Throat is the second most critical component after angles and should be polished with utmost care. This gave it a longer point for the magazine to allow the rounds to come out of the magazine and feed into the chamber. Reliability is the main concern for me when I re-barrel this rifle. Create an account to follow your favorite communities and start taking part in conversations. Machined from 4150 Chrome Moly Vanadium Steel and feature a QPQ corrosion resistant finish and QPQ coated M4 feed ramp extension. Pasted as rich text. Any use of this content without express written consent is prohibited. I'd rather just pay the gunsmith to make it work than hunt down another barrel/upper if possible. Watch a video about our Modern Series AR barrel: colt A1E1 733 uppers didn't have extended carbine feedramps ? again, Thanks. You cannot paste images directly. The only one I found is LaRue's upper, but it won't work with the hand guard I'm using (Geissele MKIII). - The Shooter's Log, 2012 SHOT Show Special Report: Del-Ton TRX Rifle and More! JavaScript is disabled. Oh well, as I tell my lovely and understanding bride, guns are relatively free. it's the ammo and training that cost real money. Recommend using a gunsmith this route too if you are not comfortable. The difference between standard feed ramps and M4 ramps is easy to see. May 17, 2008 in The Armorer. 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. [ARCHIVED THREAD] - M4 feed ramp barrel in a non M4 ramp upper. One new winner* is announced every week! 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. Reddit and its partners use cookies and similar technologies to provide you with a better experience. The ramps are in the barrel extension. Seems M4 is all the rage these days. Modern Series Barrels. Some suggest taking a grinder to the extension area. However, if youre wanting to rebarrel a non-M4-cut upper with an M4 feed-ramp equipped barrel, or going the other direction: you have a new upper thats been relieved to fit with the M4 ramps, and a non-M4-cut barrel extension, and that wont work! M4 barrel to non M4 receiver is fine, but not the other way around. 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 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. 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. From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. Description Genuine 14.5" SOCOM, carbine length gas system barrel from Colt. All Rights Reserved. To measure just where the round makes impact on the feed ramps, I did not use any sort of micrometer to measure. Then you can get a regular rifle barrel for the upper with no ramps. FFL Fax: 866-721-8691. 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.) . 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. Copyright 2016 - 2023 by AdventureFootstep.com. 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. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. They offer a lower, more extensive, and smoother entry for any round of ammo, whether its necessary or not. You wrote that much to make a point that should have taken about 100 words? Home Firearms Figuring Out Feed Ramps. Check often for fit. Interesting reading. Feeds flawlessly. The best case is to have both an upper and barrel that have the feed ramps. Display as a link instead, FN AR-15 5.56X45mm Nato . What is the difference between Modern, Performance, and Premium Series Barrels? Any body need a anchor for a very small boat? BUT if you find someone to grind your feed ramps and they do a good job, post it up and let us know. i have the rifle barrel. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. They guide the bullet up and into the chamber. Your link has been automatically embedded. I'll probably build a pistol out of this one. They aid in feeding the round into the chamber from the magazine more easily, which make uppers and barrel extension matched. Somwhere in the 1990s I believe, Colt designed the M4 feed ramps, where they took some of the material out of the upper receiver, cut two little ramps in it and then cut the ramps in the barrel extention a little further forward. Anything else you want to share about M4 clones would be appreciated, especially when it comes to a reliable rifle. 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. 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. So there's a lot more going on with rounds bouncing up and down in the mags etc. Good call. Does it make a big difference? Went back to the sellers website and found I was not the only one with problems. 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. Then the manufacturer discontinued the barrel. Konza Defender M-LOK 5.56 16" Rifle 1x7 FEATURES: 16" 4150 Nitride 1x7 5.56 Barrel T-Marked Upper with M4 Feed Ramps Steel Micro Gas Block, and Carbine Length Gas Tube 15" 7075 T6 Aluminum Free Float M-LOK Hand Guard A2 Muzzle Break BCG is an M16 Style Nitride QPQ Finish Charging Handle Mil-Spec 6 Position Mil-Spec Diameter Stock if you are OK with 3MOA, you might go 20,000 rounds! 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. While I've got everything apart, I'm thinking I just want to put an M4 barrel extension on. The M4, and the CAR-15, before it have had similar problems like the ones you mentioned. Brevity matters. Forged 7075-T6 aluminum is harder than a bulls balls. I've been thinking about doing sort of an "Early Diemaco C8 carbine" clone build with a C7 style upper receiver. Earlfillmore 13 hr. In general, all you need to understand is that the M4 feed ramps include the barrel extension and upper receiver. All Rights Reserved. First of Im not a gunsmith or firearms professional. I use it for hunting dogs only. M4 feed ramps are not an original design, they were designed for the M4 In fact, the . Its highly recommended to put any AR-platform firearm together with a matching M4 barrel extension and upper receiver set. Rifles, Uppers, Lowers, Barrels, and more, [ARCHIVED THREAD] - Rifle vs m4 feed ramps, http://i135.photobucket.com/albums/q125/PursuitSS/Postings%20photos/c0d26170b75c3e6f9ea65a7d0862247e.jpg. I've modified barrel/receivers even before M4 cuts came out and done some receivers when the barrels had cuts. 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? Hasn't misfed yet, through initial break in up through 1k rounds, and that's mag length ammo. *Must have a registered ARFCOM account to win. Press question mark to learn the rest of the keyboard shortcuts. . For instance I was looking at the BCM upper receiver, and it said it had M4 feed ramps machined into the upper. Product Description Surplus Colt 14.5" SOCOM, carbine length gas system barrel from Colt. He had more to say and added some more engineer and gun designer speak too. M4 ramps help in feeding in for carbine in full auto. Thats receivers, bolts, and on down the list of the 100 or so parts that can make up an AR-15. aaargh.. that's the setup I hate to see. Notify me of follow-up comments by email. 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. Mil-spec is good for the masses, and if you want the job done it is a great start. A closer look at uppers and barrel extensions. 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). If it's happening regularly, check the magazines you are using for serviceability. Site towers are not "F" marked SPECS: Length- 14.5". Feed ramps being m4 or. So, lets glide down these lines below to erase your misconceptions about them. Get The Best Trigger Pull Gauges To Make Every Shot Count. I replaced the M4 feed ramp barrel with a monolithic feed ramp barrel and no more problems. They . 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. The M4 receiver feed ramps are cut at a steeper angle and, as a result, extend down into the receiver wall. However Ive built numerous ar15 and lr308 rifles and pistols. Rear side of a CZ-75B pistol barrel showing the (here dirty) feed ramp. 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. 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? Copyright 1996-2023 AR15.COM LLC. I like getting another Upper idea then you could end up with two rifles! An older-version (or A2-style) feed ramp is cut only on the barrel extension itself (top). Well, over the course of 5,000 rounds at .40 a round, you spent two grand on ammo. The mil actually only specs M4 feed ramps for use in its M4s. The A2's are pretty reliable guns, but trashed mags can cause them to have malfunctions also. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Avoid Polishing Too Lightly Or Too Roughly Don't ever put non M4 ramped barrel on a M4 ramped upper receiver. Experts advise on 31 degrees+30 minus-zip. When I function tested it the first time with live half-jacketed rounds I had the worst FTF jam I have ever experienced. Gas block area is .750 diameter. AR9 - Help diagnosing feeding issue. Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. Thanks. When carrying out feed ramp polishing, it is crucial to prioritize the frame's angles, which is a critical part of the feed ramp. Feels like a silly question now that it makes sense. . Create Account; Log Out ; Log In ; Wishlist 0; Shopping Cart 0; Home; About You will be able to leave a comment after signing in, AR15Armory.com The tip of the cartridge rarely comes into contact with the upper receiver. Can I use a barrel with M4 feed ramps with an upper that isnt M4 matched? With the bcg moving that much faster, the magazine springs were having a hard time supplying the rounds fast enough, AS WELL AS the tips of the rounds were digging into the feed ramps and catching. Please allow 5~10 days for assembly and testing before ship date. Either way is good and both types work great with semi auto only guns. http://www.ar15fornoobs.com/wp-content/uploads/feedramps.jpg. 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). The upper is designed to have two levels of top rails for mounting of night vision in front of scopes. A4 Complete Upper Receiver - 7075 Forged A4 Flat Top Upper Receiver - M4 Feed Ramps Includes: - Add to Cart. Some barrels I see for sale say they include M4 feed ramps, and some uppers say they include them too. 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. 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? It's best to use rifle/rifle combo or M4/M4. 3. They are also 1/7 twist, 4150 steel, chrome lined, and button rifled like the real deal! Editors Note: This article was originally published in January of 2019. Seems like it should work to me, but be a real challenge to keep clean and be damned ugly to boot. Only took a few minutes. can the barrel extension be bought individualy? I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. 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. My alternative plan is to do exactly as you describe. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. If this is your first visit, be sure to Press question mark to learn the rest of the keyboard shortcuts. DSA has fat top, Mueller, non feed ramp uppers for $40. Press J to jump to the feed. Additionally, in this increasingly specialized world of AR-15 parts that we live in, there are proprietary feed ramp cuts used for some alternate cartridges, such as .458 SOCOM. 1 is a standard and the other for use with m4 feed ramp barrels. So, I had purchased a 458 upper. 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.