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M4 Feed Ramps

This is a discussion on M4 Feed Ramps within the M16 AR15 forums, part of the Rifle Forum category; Anyone have a link or pics of the M4 ramps VS the old style? I have a new flattop upper with M4 ramps and the ...


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Old March 21st, 2010, 06:06 AM   #1
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M4 Feed Ramps

Anyone have a link or pics of the M4 ramps VS the old style? I have a new flattop upper with M4 ramps and the couple barrels I have laying around dont. I assume the M4 ramps are cut deeper in the barrel extension to match up with the upper? I was going to wait and look at a gun show, but dont want to go today just for this.

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Old March 21st, 2010, 08:06 AM   #2
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Check this out Danny. A few months ago when I started to build my first AR I had no idea what an M4 feedramp was and I foundthis picture. It should explain everything.

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Old March 21st, 2010, 01:46 PM   #3
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I guess I can change the barrel extensions. Heck, I thought they were turned as part of the barrel. Thanks for the pics.

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Old March 21st, 2010, 03:19 PM   #4
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Sounds good! Good luck with your project

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Old March 21st, 2010, 05:06 PM   #5
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What is the purpose of the M4 feed ramps as opposed to the standard AR configuration? I'm fixing to build my first M4 upper...

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Old March 21st, 2010, 05:12 PM   #6
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You really can not just change a barrel extension that simply. There are two main issues you will need to address, head space and the timing of the new barrel extension. You might get lucky and have proper HS ,but what about if the new extension is not indexed properly? The alignment pin on the B.E. and the gas port in the barrel must be in perfect alignment or your front sight will be off to one side. I changed out a B.E. for a customer a few years ago due to a crack in the B.E. I had to cut the barrel shoulder back and re chamber the barrel to get the new B.E. to time properly and to achive proper headspace. I have been building and shooting AR's in competition for 17 years and IMO a semi auto AR does not need M4 feed ramps.

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Old March 21st, 2010, 05:48 PM   #7
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Quote:
Originally Posted by charlie98 View Post
What is the purpose of the M4 feed ramps as opposed to the standard AR configuration? I'm fixing to build my first M4 upper...
The M4 feedramps were designed for the Military's M4 carbine. They had some feeding issues due to the high cyclic rate produced by the 14 1/2 in. barrel and the short gas system.

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Old March 21st, 2010, 05:53 PM   #8
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You can put m4 cuts in your barrel extension your self with a Dremmel. If you install your barrel in a upper receiver with m4 feed ramps you can use the Dremmel to grind the barrel extension to match.

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Old March 21st, 2010, 08:42 PM   #9
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The M4 feedramps were designed for the Military's M4 carbine. They had some feeding issues due to the high cyclic rate produced by the 14 1/2 in. barrel and the short gas system.


I was told it would help loading the BTHP rounds. The guy told me the HP take a beating. I am talking about the larger 77 gr SMK's. Any thoughts? Was it a line of smack?

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Old March 21st, 2010, 09:20 PM   #10
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I have the same opinion as the armorer above. M4 feed ramps are only necessary for a full-auto M4. Semi-auto rifles are never going to get as hot or as fouled as full-auto rifles under combat conditions. I have rifles with and without M4 feed ramps and always thought it was a gimic to sell more expensive AR-15s.

It does affect resale value and for that reason I would build any new AR-15 from a BCM upper with a full-auto BCM BCG. Their uppers are fantastic and for $625 you can have the very best upper and BCG money can buy. $300 for a complete lower with RRA NM trigger and you are GTG. I built a few off of LRB lowers that can be had for $90 out the door locally. MOE stock and grip, Troy rear BUIS, and you have yourself a great home defense rifle or 1 MOA range blaster. I went with an Aimpoint CompML3 for my home defense rifle and a RRA carry handle for my mid-length carbine. RRA carry handles are the best I have used and can be had from AR15Sales.com for $104 shipped.

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Old March 22nd, 2010, 06:07 AM   #11
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Quote:
Originally Posted by EBAM1A View Post
You can put m4 cuts in your barrel extension your self with a Dremmel. If you install your barrel in a upper receiver with m4 feed ramps you can use the Dremmel to grind the barrel extension to match.
WARNING! Danger Will Robinson. Danger!!!

OK, so I'm a little dramatic this morning, but I do NOT recommend cutting feed ramps into either the barrel extension OR the lower receiver UNLESS you anodize the part after you do it. Here's why:

When you cut/grind the feed ramps, the metal underneath is soft aluminum. The points of the bullets WILL start to dig into the aluminum and that will eventually cause many feeding problems as the bullet point will jam into the soft aluminum. Now, if you annodized the receivers again, this would not be a problem, but most people don't do that.

Also, you do not need those ramps on anything BUT full auto guns as someone already mentioned.

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Old March 22nd, 2010, 08:19 AM   #12
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Quote:
Originally Posted by Gus Fisher View Post
Also, you do not need those ramps on anything BUT full auto guns as someone already mentioned.
82nd Airborne is correct - M4 extentions help in feeding BTHP's, soft points, and other "longer than 55-62 grain" rounds. Doesn't hurt anything, too.

Caveat:

If you have a barrel with standard ramps, you must ensure that you have a "rifle" barrel extention. If you don't, you're going to have problems with feeding, guaranteed. Saw this happen with a garage-built carbine a buddy of mine bought. At the range, he had multiple feeding problems, regardless of magazine used. Took one look at the chamber: rifle-style feed ramps and a M4 style extention. Instead of a nice smooth ramp, there was a clear break (step, really) that every other round nosedived on during firing.

Like the poster above said, a dremel's not the way to go in fixing the problem. If you can't do the work yourself, take it to a 'smith and get it done.

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Old March 22nd, 2010, 08:20 AM   #13
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I did not say to grind on the receiver only the steel barrel extension. There are many reputible ar smiths that offer this

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Old March 22nd, 2010, 06:39 PM   #14
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I have been shooting Hornady 68gr.HPBT's in my AR comp. rifle for years. I have never had a feeding issue with the standard feed ramps.YMMV.

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Old March 22nd, 2010, 07:08 PM   #15
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The M4 feed ramps have also become a standard for 6.8SPC chambered uppers, for reliable feeding. ADCO will grind them in for about $15, plus the cost to ship the upper.

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