Thanks! So, lets glide down these lines below to erase your misconceptions about them. Powered by Invision Community. Some argue that, factually, its a step to enable a smoother feeding. I just need a little guidance on this and I'm having trouble getting good results from Google. 1 is a standard and the other for use with m4 feed ramp barrels. Press J to jump to the feed. Press question mark to learn the rest of the keyboard shortcuts. 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). The angle is going to be key, alot of people attempt to mimic the angle of the barrel feed ramps, this is incorrect. If you have an account, sign in now to post with your account. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. An older-version (or A2-style) feed ramp is cut only on the barrel extension itself (top). The rifle receiver, doesn't have ramps on the receiver, they are only cut into the barrel. A forum community dedicated to drag racing drivers and enthusiasts. i have an extra brand new M4 barrel extension ramp to replace a rifle ramp. So, what is the difference between M4 feed ramps and regular ones? 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? The M4 was the first (allegedy) carbine length gas system. Standard vs M4 Feed Ramps, what's the difference #1056 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). However Ive built numerous ar15 and lr308 rifles and pistols. 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. Feed Ramps -300BlkTalk You can put a M4 barrel and non-M4 receiver together, but you can't mismatch them the other way. In short, if you have a Dremmel you can do it yourself. I use it for hunting dogs only. 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. I should have taken my own advice for once. 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 to non M4 receiver is fine, but not the other way around. 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. I can probably get the upper reciever first. Barrels are Douglas 416 stainless steel with 1-7 twist with M4 feed ramps Our 6mm ARC barrel come standard with 1-7.5 Twist, M4 Feed Ramps and gas tube. 3. What is an m4 feed ramp? 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. It has ran flawlessly (barring tuning of the gasblock when new) with several different brands of magazines and ammo. Here you can see an upper with "rifle" feedramps. I didnt think anything about it having M4 feed ramps. Feedramps, proper staking of castle nuts, forward assist (yep went there)S-happens seen it. 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. aaargh.. that's the setup I hate to see. Go slow and you'll be done in no time. upper recievers and barrels are hard to comeby. 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. It is removeable with a special wrench and a barrel clamp/vise. Should M4 feed ramps come with the barrel or upper? : r/ar15 - reddit I will check with compass lake. Ready to drop onto a complete lower receiver. Feed Ramp Polishing - How To Do It Properly? - Homestead & Prepper The good idea is that the round, presented at a lower plane, will contact other lower feed ramps and go right on in. For a better experience, please enable JavaScript in your browser before proceeding. That is what I tell people when they try to convince me that they need a stainless barrel instead of chrome-moly. You need to match up barrels to receivers for optimum performance. 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. After two months of back and forth, cleaned up the feed ramps. 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, an M4 feed ramp includes the barrel extension and the upper. M4 Feedramps - AR-15 Pro Married pretty well with my Seekins machined lower. Feed ramps on barrel extensions are a good example. Colt LE6920SOCOM M4 Carbine 5.56 16.1 Barrel SOCOM Sight 30-rd For a better experience, please enable JavaScript in your browser before proceeding. And that the M4s and M4A1s are issued M855 which has a slight difference in bullet shape vs. the older 55gr M193 BALL. This has been my concern with modifying the aluminum parts. Modify AR15 A2 barrel extension for M4 feed ramp? They provide a lower, wider, and smoother entry for any round of ammo, whether its necessary or not. The manufacturer said they had sold hundreds of barrels with out problems reported. Caught a deal on a matched barrel and bolt. Both. The mil actually only specs M4 feed ramps for use in its M4s. Either way is good and both types work great with semi auto only guns. 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. 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 . EDIT: Okay, I understand now! I've seen that pic, it is a good reference. They were not intended to be super long range man killers. 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. By 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. 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 I guess it depends on what your relationship to the necessary shop activities is. A4 Complete Upper Receiver. So I'm working on my first build, and I'm a little confused. Del-Ton, Inc. AR-15 16" M4 Custom Upper 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. How long your barrel "lasts" depends on what your accuracy threshold is before you decide it is too bad to keep using. Most of barrel assemblies and upper receivers on the market now have a present of M4 feed ramps. Is it kosher to add M4 feed ramps to a standard upper to match an m4 ramped barrel? well.. it's kinda hard to get stuff in this part of the world. All comments are held for moderation and will appear after approval. A couple of times I ended up with the OK set up from the picture above. Gas block area is .750 diameter. Using an upper with M4 feed ramps with a barrel that does not have them will lead to feed problems as it creates a ledge/lip that can catch the bullet tip as it tries to feed. Load a magazine with two or three rounds, lock the bolt group back on your rifle or carbine and insert the magazine. If you don't clean it but demand 3/4MOA you might get 1,500. Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more. 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. if you are OK with 3MOA, you might go 20,000 rounds! Douglas 5.56 Stainless Steel Barrel 18" - 1~7 twist Well, over the course of 5,000 rounds at .40 a round, you spent two grand on ammo. AR15 20 inch Upper Receiver Group (SS) w/ Handguard | BCM I think you will find that the tip of the bullet clears the M4 cuts in the upper receiver by a wide margin. In most cases the ramps only help during full auto mode while cycling at a high rate. Thats an important thing since without the feed ramps, issues can arise when receivers and barrel extensions are mismatched. Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types. Adding feedramps - M4Carbine.net The M4 receiver feed ramps are cut at a steeper angle and, as a result, extend down into the receiver wall. Rifle vs m4 feed ramps - AR15.COM PSA PA-15 16"M4 Phosphate 5.56 NATO 1/7 Classic AR-15 Rifle with 13.5"M Only took a few minutes. Seems counter intuitive to recommend an M4 cut upper, especially if the barrel Im looking at has the rifle feed ramp (not M4 cut). The barrel blanks available are made from 416 Stainless Steel. 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. Previous. Then the manufacturer discontinued the barrel. Semi autos run slower than full autos. 5. AR9 - Help diagnosing feeding issue - Calguns.net Mind shooting me a link where I can pick on a C marked A1 carry handle for $150? The dimensions are different between the two, so theyd have to change some things to the feed ramps dimensions. Display as a link instead, This can lead to a rare but odd situation; barrel and receiver mismatch. I wouldn't be concerned at all with any wear after modifying an upper receiver. The barrels also had to be modified. I suggest you get a rifle receiver. For someone who is new at trying to understand feed ramps it helps to read a couple different explanations. M4 Feed ramps on barrel extensions are a solid example. 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'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. FN AR-15 5.56X45mm Nato 14.70" M4 Profile Barrel Carbine Length Gas Home Firearms Figuring Out Feed Ramps. I prefer them. [WTB] Black A1 carry handle upper NON-m4 feed ramp $200 However the DD 14.5 are ideally meant to mate up with M4 style upper receiver feedramps. Its not a big deal but still an important thing to remember and understand. M4-style barrel extension with Rifle-type upper - Rifle - Technical 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. Some gun owners believe that the M4 ramps can help for some of the larger-diameter cartridges in use. from my service in the 70s to my personal weapons, all of my ARs are early 1970 slab sided Colt SP1s. If I can correct an issue before it's an issue that is preferred. Cutting M4 feed ramps - Calguns.net Remember less is more, little by little. 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. 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. Ballistic Performance of Federal Punch .22 LR Ammunition with the Heritage Barkeep #1063. You have the option of barrel type, thread, fluting, finish type and to add a match bolt. 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. 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. In military situations, it is advantageous for rifles to function with damaged, worn, or less than ideally serviceable magazines. 14.5" M4 SOCOM Barrel Assembly with Sight Tower - Brownells 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. Any body need a anchor for a very small boat? For new construction barrels only. 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. Does anyone have a follow up that confirms or denies my claim? They aid in feeding the round into the chamber from the magazine more easily, which make uppers and barrel extension matched. Shorter length equates to much higher pressure in the upper receiver. Surplus Colt 14.5 M4 SOCOM Carbine Barrel 1/7 Twist Brevity matters. Experts advise on 31 degrees+30 minus-zip. Description Genuine 14.5" SOCOM, carbine length gas system barrel from Colt. Share it in the comments section. Full M4 feed ramps start on the upper and continue onto the barrel extension. The Bullet ~ Handguns, Rifles and Shotguns, http://thearguys.com/ar-facts/m4-feed-ramps/. Ideally both. If your upper isn't showing signs of bullets rubbing on the aluminum under the barrel extension, you should be good with M4 ramps. I'm lookin for a clear definition as to what they are, and what they do to enhance a given rifle's performance? 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 Contents: 1 Diamond Burr (For Colt 2 Stage Ramps) 1 Cut Lube (For Diamond Burr) 1 Bullet Stone (For Reshaping . I had seen these pix years ago and dismissed the idea of mix and match. Upper Receiver, A4, Flat Top, USGI, Numbered, AR-Stoner Upper Receiver Stripped AR-15 A3 Flat-Top Matte, Black River Tactical 16 Cold Hammer Forged Optimum Barrel Accuracy Evaluation. Notice how the ramp starts on the barrel extension and not in the receiver. I read in Bravo company that there are 2 kinds of flat top upper. Notify me of follow-up comments by email. My experience with ARs is all A-1s. . *Must have a registered ARFCOM account to win. 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. -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! Do you need an M4 feed ramp on your AR? Here is some info. Forged 7075-T6 aluminum is harder than a bulls balls. "C" stamp and CAGE code available. What is the difference between Modern, Performance, and Premium Series Barrels? 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. I would only add the feed ramps to the receiver if I had feeding issues, which you should not have. 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. Went back to the sellers website and found I was not the only one with problems. Making a non M4 feed ramp barrel work in an M4 feed ramp upper. Read Now. 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. As a result, the factory machined M4 feed ramps on the receiver are hard coat anodized which adds significant strength to the aluminum. The upper is designed to have two levels of top rails for mounting of night vision in front of scopes. It's best to have M4 ramps on both the upper and barrel. It gives a longer ramp that is less steep into the chamber. Getting the AR Barrel and Receiver Configuration Correct 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. For instance I was looking at the BCM upper receiver, and it said it had M4 feed ramps machined into the upper. 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 The A2's are pretty reliable guns, but trashed mags can cause them to have malfunctions also. are all barrels w/ m4 feed ramps?? In general, all you need to understand is that the M4 feed ramps include the barrel extension and upper receiver. The last is using the best and right ammo for the job. I'm a machinist in the aerospace industry and lucky enough to have. Thats true overall and good to keep in mind. M4 16", SBN, 1:7, 5.56 NATO Barrel Specifications: - Caliber: 5.56 NATO (.223 REM) - Gas Tube: Car Add to Cart. 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. 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? Avoid Polishing Too Lightly Or Too Roughly Its easier to add feed ramps to the receiver not so easy to add them to the barrel extension. To conclude, the M4 feed ramps bring a lot of improvements to the AR-platform firearms. Sorta. Please allow 5~10 days for assembly and testing before ship date. We want you, our readers, to be able to make informed decisions. Its also recommended you polish the ramps once youve achieved the appropriate angle. No Feed Ramps on upper? - General Discussion - 308AR.com Community Recommend using a gunsmith this route too if you are not comfortable. 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.
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