BUT, I DO NOT TRUST MY LIFE TO THAT WEAPON. 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. All NFA rules apply. Also, barrel life is relative. $101.95. The ramps are in the barrel extension. Product Details Douglas 18" Flat Dark Earth Cerakoted 416 stainless steel barrel with 1-7 twist and M4 feed ramps. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. I put together a second AR9 that is having a feeding issue, even if using similar parts as the first one. All this basically means is that the ramps continue from the barrel extension down through the upper receiver tonthe magazine. 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. Forged 7075-T6 aluminum is harder than a bulls balls. 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. In military situations, it is advantageous for rifles to function with damaged, worn, or less than ideally serviceable magazines. The dimensions are different between the two, so theyd have to change some things to the feed ramps dimensions. 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. 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. Reliability is the main concern for me when I re-barrel this rifle. Most of barrel assemblies and upper receivers on the market now have a present of M4 feed ramps. 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. Ballistic Performance of Federal Punch .22 LR Ammunition with the Heritage Barkeep #1063. Feeds flawlessly. 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. I guess it depends on what your relationship to the necessary shop activities is. The tip of the cartridge rarely comes into contact with the upper receiver. ago Costs about $40-50 to have the feed ramps reprofiled from what I can gather. We have four combinations here: Good call. What's the difference? 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. No feed ramps. Please be respectful of others. There are now thousands of upper receivers and ready-to-use barrels that have the cuts of M4 feed ramps. Thanks. You must log in or register to reply here. I like all my guns to be reliable. M4 feed ramps are not an original design, they were designed for the M4 In fact, the . 1 is a standard and the other for use with m4 feed ramp barrels. And that is the important thing! I recently picked up a barrel that I thought had M4 feed ramps, but it doesn't line up with my M4 feed ramp upper. Full M4 feed ramps start on the upper and continue onto the barrel extension. There are now thousands of upper receivers and ready-to-use barrels that have the cuts of M4 feed ramps. I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. If you have an account, sign in now to post with your account. Don't ever put non M4 ramped barrel on a M4 ramped upper receiver. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. Well, over the course of 5,000 rounds at .40 a round, you spent two grand on ammo. Modern Series Barrels. And that the M4s and M4A1s are issued M855 which has a slight difference in bullet shape vs. the older 55gr M193 BALL. An older-version (or A2-style) feed ramp is cut only on the barrel extension itself (top). The Bullet ~ Handguns, Rifles and Shotguns, http://thearguys.com/ar-facts/m4-feed-ramps/. JavaScript is disabled. The ramps on the regular rifle-type extension are cut just to the edge of the extension. [ARCHIVED THREAD] - M4 feed ramp barrel in a non M4 ramp upper. 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. One new winner* is announced every week! Its easier to add feed ramps to the receiver not so easy to add them to the barrel extension. Some argue that, factually, its a step to enable a smoother feeding. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. I am having a tough time finding an in-stock barrel (18 or 20 incher) with a rifle extension on it. It's near impossible to replace the carry handle upper I have these days, and finding a colt chrome lined 20" light weight barrel isn't a walk in the park either. The last is using the best and right ammo for the job. BrianEnos.com These Mil-Spec M4 feed ramps are part of the original CNC manufacturing process. The A2's are pretty reliable guns, but trashed mags can cause them to have malfunctions also. What is an m4 feed ramp? instead of mil-spec. The M4, and the CAR-15, before it have had similar problems like the ones you mentioned. Thats why AR10s- And Scar heavies exist for. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Any use of this content without express written consent is prohibited. Theres a bit more to it than just polishing. 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 Press question mark to learn the rest of the keyboard shortcuts. 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. 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. Not all mil-spec features advertised on the product information are the real mil-specs. 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. Thats true overall and good to keep in mind. The M4 Style Feed ramps And Barrel Extension Provide Consistent Feeding And The Matte Black Manganese Phosphate Finish resists External Corrosion And OxidationLength: 14.70"Model: AR-15Finish: Manganese PhosphateBarrel Type: Carbine LengthBarrel Features: Chrome-LinedManufacturer: FN Mfg Number: 20-100405Model: AR-15 . I wont buy a barrel that isnt a wylde 223 556 but Im only now noticing. For a better experience, please enable JavaScript in your browser before proceeding. "A Bad Day At The Range Is Better Than A Great Day Working". I've modified barrel/receivers even before M4 cuts came out and done some receivers when the barrels had cuts. A4 Complete Upper Receiver. Not saying a really good gunsmith cant do it, just that theres a bit of an involved process. Rear side of a CZ-75B pistol barrel showing the (here dirty) feed ramp. and add them to non-m4 barrels.? 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. I'm planning on replacing my forearm with a Larue 13.5. 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. 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. 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. The Shooter's Log, is to provide informationnot opinionsto our customers and the shooting community. Guess what? I read in Bravo company that there are 2 kinds of flat top upper. It has 2 ramps cut into the receiver to help the rounds feed into the chamber. Anything else you want to share about M4 clones would be appreciated, especially when it comes to a reliable rifle. All Rights Reserved. Finding the proper upper receiver is your best option. 50 bucks one way or the other on the barrel ain't squat! Went back to the sellers website and found I was not the only one with problems. The barrel Throat is the second most critical component after angles and should be polished with utmost care. You need to match up barrels to receivers for optimum performance. The photo shows the dents and the bolt lugs line up perfectly. I will check with compass lake. are all barrels w/ m4 feed ramps?? Ar-15 Manufacturers Should Be Avoided: Which Should You Buy? The rifle-platform M16s dont use them. You also repeated yourself. It may not display this or other websites correctly. Absolutely nothing to do with casing diameter, or whatever other weird sht you guys imagine. I recently built an AR9 (Glock Mags) that has been running flawlessly for about 3-400rds. Upload or insert images from URL. If I can correct an issue before it's an issue that is preferred. 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. So the engineers lowered the feed rampa into the receiver. Use this M4 Barrel extention with M4 feedramps. Notify me of follow-up comments by email. 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. 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. Go back to writing school. Get The Best Trigger Pull Gauges To Make Every Shot Count. Please allow 5~10 days for assembly and testing before ship date. 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. Sent back again. Do you have an AR barrel or feed ramp tip? By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. As a result, the factory machined M4 feed ramps on the receiver are hard coat anodized which adds significant strength to the aluminum. Our 6mm ARC barrel come standard with 1-7.5 Twist, M4 Feed Ramps and gas tube. Does NOT include pin However Ive built numerous ar15 and lr308 rifles and pistols. Single Action and Double Action Which One Is Better For You? Looking For Bear Creek Arsenal Barrels Review? The only one I found is LaRue's upper, but it won't work with the hand guard I'm using (Geissele MKIII). Clear editor. Those ramps line up with the barrel, which are cut deeper than on a rifle barrel. If you ever have an issue, then look at getting a correct barrel for the upper. First, the M4 barrel and non-M4 upper isnt likely to cause issues, but due to the relief cut on an M4-spec upper, there will be a gap that works like an edge that most definitely can snag the bullet and stub the round. can you buy feed ramps individually? And it appears that the bolt is slamming into the top of the bullet. Jams and misfires. By Yamil Sued August 6, 2021. As they are becoming more and more a standard, and certainly do not do any harm to us. 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. If it's happening regularly, check the magazines you are using for serviceability. The rifle receiver, doesn't have ramps on the receiver, they are only cut into the barrel. I'm assuming that you only need the ramps from one or the other. aaargh.. that's the setup I hate to see. AR9 - Help diagnosing feeding issue. What is the difference between Modern, Performance, and Premium Series Barrels? 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. Its a miracle! I wouldn't be concerned at all with any wear after modifying an upper receiver. Looking to spend $180-250 (depending on condition, forge mark and if a rear sight is included or not.) I notice that's a Gibbz (or Gibbz-type) upper. I've been thinking about doing sort of an "Early Diemaco C8 carbine" clone build with a C7 style upper receiver. 30 cal. http://www.ar15fornoobs.com/wp-content/uploads/feedramps.jpg. The upper I want to rebarrel is modified for Service Rifle competition so it's not quite as cheap as buying another $89 upper from Aero. Thread: Adding M4 feedramps to A1/C7 upper. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. Ideally both.