Powered by Invision Community. A feed ramp is a basic feature of many breech loading cartridge firearm designs. I've modified barrel/receivers even before M4 cuts came out and done some receivers when the barrels had cuts. 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. Higher pressure equte to parts (bcg, buffer, buffer spring, ROUNDS, etc) experiencing much higher wear/tear. Here you can see an upper with "rifle" feedramps. 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. 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. And that is the important thing! Try this little exercise: 1. 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. http://www.ar15fornoobs.com/wp-content/uploads/feedramps.jpg. can the barrel extension be bought individualy? 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. 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. 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 2 ramps cut into the receiver to help the rounds feed into the chamber. Editors Note: This article was originally published in January of 2019. Experts advise on 31 degrees+30 minus-zip. April 23, 2014 in Rifle - Technical. To conclude, the M4 feed ramps bring a lot of improvements to the AR-platform firearms. The M4 was the first (allegedy) carbine length gas system. Its also recommended you polish the ramps once youve achieved the appropriate angle. Installing a Luth-AR Rifle Buffer Tube and an A2 Stock #1041. 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. A4 Complete Upper Receiver. So there's a lot more going on with rounds bouncing up and down in the mags etc. well.. it's kinda hard to get stuff in this part of the world. Our 6mm ARC barrel come standard with 1-7.5 Twist, M4 Feed Ramps and gas tube. Previous. Description. 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. I have a 723 build (w/ C7 upper) and a 727 build (A2 upper) that use 14.5" Colt M4 barrels. The M4 receiver feed ramps are cut at a steeper angle and, as a result, extend down into the receiver wall. I suggest you get a rifle receiver. However Ive built numerous ar15 and lr308 rifles and pistols. 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. 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. M16s and M16-A1s run at 750 rounds per minute in full auto. In military situations, it is advantageous for rifles to function with damaged, worn, or less than ideally serviceable magazines. They offer a lower, more extensive, and smoother entry for any round of ammo, whether its necessary or not. The Bullet ~ Handguns, Rifles and Shotguns, http://thearguys.com/ar-facts/m4-feed-ramps/. this is the barrel designed and profiled for the Mark 12 Mod 0 uppers and rifles. Go back to writing school. Also, barrel life is relative. Sent back again. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Owning Best Ruger SR9c Accessories Can Change Your Life. 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. Costs about $40-50 to have the feed ramps reprofiled from what I can gather. All Rights Reserved. Gun smith said , not head spaced properly. Watch a video about our Modern Series AR barrel: Id just get one for that barrel and find a barrel with m4 extension for the upper you already have. My experience with ARs is all A-1s. You wrote that much to make a point that should have taken about 100 words? M4 feed ramps. Go slow and you'll be done in no time. If your upper isn't showing signs of bullets rubbing on the aluminum under the barrel extension, you should be good with M4 ramps. The best case is to have both an upper and barrel that have the feed ramps. 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.) . It's an interesting question. How long your barrel "lasts" depends on what your accuracy threshold is before you decide it is too bad to keep using. 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. 4. Your discussions, feedback and comments are welcome here as long as they are relevant and insightful. There's no downside to having M4 feedramps on your carbine, but they are not as necessary without full auto and when using followers that will not tilt (or in a 20 AR15). The parts are interchangeable. They are better! Remember less is more, little by little. Most of barrel assemblies and upper receivers on the market now have a present of M4 feed ramps. AAC and anybody else that has any reasonable expectation of quality and reliability use an M4 feed ramp. Your email address will not be published. Machined from 4150 Chrome Moly Vanadium Steel and feature a QPQ corrosion resistant finish and QPQ coated M4 feed ramp extension. It is removeable with a special wrench and a barrel clamp/vise. 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. The barrel blanks available are made from 416 Stainless Steel. For use by barrel manufacturers. Does it make a big difference? Feed ramps on barrel extensions are a good example. I can assure you that most mods that deviate from the original design aren't 100% reliable. 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? By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Any use of this content without express written consent is prohibited. 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. 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 You have the option of barrel type, thread, fluting, finish type and to add a match bolt. With the increased use of larger-diameter cased cartridges, the M4 feed ramps are proving their values when using them in those cartridges. - 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. Barrel is medium SPR profiled barrel, threaded with a 1/2-28 thread for the AE brakes and collar. 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. The tip of the cartridge rarely comes into contact with the upper receiver. Supposedly you'll only notice issues with rapid/auto fire with a configuration like this. Product Description Surplus Colt 14.5" SOCOM, carbine length gas system barrel from Colt. 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. is the m4 feedramp common in barrel extensions? America's Ultimate Shooting Sports Discounter, Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Pinterest (Opens in new window). I use it for hunting dogs only. Feedramps, proper staking of castle nuts, forward assist (yep went there)S-happens seen it. My alternative plan is to do exactly as you describe. Seems counter intuitive to recommend an M4 cut upper, especially if the barrel Im looking at has the rifle feed ramp (not M4 cut). 's blog. If it's happening regularly, check the magazines you are using for serviceability. I'd rather just pay the gunsmith to make it work than hunt down another barrel/upper if possible. Gas block area is .750 diameter. 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. Is one better than the other? Caught a deal on a matched barrel and bolt. Reliability is the main concern for me when I re-barrel this rifle. 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). You absolutely do not want it the other way around however. Pasted as rich text. Ballistic Performance of Federal Punch .22 LR Ammunition with the Heritage Barkeep #1063. Add M4 cuts to Barrel Ext $15.00 We can modify your rifle extension to match the M4 cuts in an upper receiver. Issues can arise when receivers and barrel extensions are mismatched. Get The Best Trigger Pull Gauges To Make Every Shot Count. If you don't clean it but demand 3/4MOA you might get 1,500. Went back to the sellers website and found I was not the only one with problems. It may not display this or other websites correctly. I recently built an AR9 (Glock Mags) that has been running flawlessly for about 3-400rds. From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm. I'm lookin for a clear definition as to what they are, and what they do to enhance a given rifle's performance? M4 feed ramps will extend the barrel extension and the upper receiver. A shorter gas tube means reduced gas pressure, and we all know what happens when there isn't enough pressure to cycle the bolt carrier group properly. Full M4 feed ramps start on the upper and continue onto the barrel extension. M16's fed pretty well before the M4 feed ramps were introduced. Only took a few minutes. The dimensions are different between the two, so theyd have to change some things to the feed ramps dimensions. I put together a second AR9 that is having a feeding issue, even if using similar parts as the first one. The closest brand new barrel you are likely to find is the Windham Weaponry 20 inch 1/7 twist chrome lined barrel. #2. Check often for fit. Regular feed ramps are cuts into the barrel extension only, which allows guiding the round into the chamber during loading, making them a fundamental feature of many breech-loading firearm designs. But, as with anything else, this work can go too far. The manufacturer said they had sold hundreds of barrels with out problems reported. Then you can get a regular rifle barrel for the upper with no ramps. You cannot paste images directly. Its a miracle! I can still use the combination. You must log in or register to reply here. Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. If your mag catch is at Spec height, you should not have a problem with an M4 cut barrel in a rifle receiver. Reddit and its partners use cookies and similar technologies to provide you with a better experience. So, what is the difference between M4 feed ramps and regular ones? I read in Bravo company that there are 2 kinds of flat top upper. As suggested, its best to match the upper and barrel extension no worries that way. Not saying a really good gunsmith cant do it, just that theres a bit of an involved process. Clear editor. 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? All things being equal and having used both weapons extensively, Id rather have the feed Ramps. M4 barrel to non M4 receiver is fine, but not the other way around. 410 stainless is also harder and more corrosion resistant than conventional 416 stainless found in other commercially available precision barrels. Not all mil-spec features advertised on the product information are the real mil-specs. Its highly recommended to put any AR-platform firearm together with a matching M4 barrel extension and upper receiver set. If this is your first visit, be sure to colt A1E1 733 uppers didn't have extended carbine feedramps ? Proper maintenance and lubrication. I would just make sure to order rifle upper with rifle barrel extension or M4 upper with M4 barrel extension. Barrel, sight and trigger work on most pistols and shotguns. Recommend using a gunsmith this route too if you are not comfortable. Guess what? 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. You will be able to leave a comment after signing in, AR15Armory.com 1 is a standard and the other for use with m4 feed ramp barrels. 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. 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. It was in the last few issues of SAR. All uppers are assembled cleaned and tested before shipping. I'm assuming that you only need the ramps from one or the other. The angle is going to be key, alot of people attempt to mimic the angle of the barrel feed ramps, this is incorrect. 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. which is basicallly an m16a1 cut down. The only other time it seems to help is if the mag is feeding the rounds with the bullet slightly angled lower than normal. The barrels also had to be modified. AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own. Rear side of a CZ-75B pistol barrel showing the (here dirty) feed ramp. Barrels are Douglas 416 stainless steel with 1-7 twist with M4 feed ramps 5. Finding the proper upper receiver is your best option.