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Posted: 9/9/2010 7:16:15 PM EDT
Please pardon my ignorance:-(

so Im building a 16" rifle...plan on ordering a yhm barrel which has m4 feed ramps? But I see these uppers being sold with m4 ramps and some without? Also see m4 barrel extensions....

What do I need or should get? Why would one need an m4 barrel extension? So very confused right now!
Link Posted: 9/9/2010 7:36:32 PM EDT
M4 feed ramps are extended compared to the Rifle feed ramps to enhance feeding during automatic use.

M4 cut with M4 extension will be the best.
M4 cut with Rifle upper is suppose to be acceptable.

The extension is on the barrel.
Link Posted: 9/9/2010 7:43:52 PM EDT
[Last Edit: 9/9/2010 7:47:03 PM EDT by LA_357SIG]
Also topic #18 under the AR15 Discussion FAQ on the top of the AR discussion page. Lots of good info there.

ETA: I thought they had a pic of the receiver cuts too.

Posted Via AR15.Com Mobile
Link Posted: 9/9/2010 7:52:30 PM EDT
Originally Posted By Mb121:
M4 feed ramps are extended compared to the Rifle feed ramps to enhance feeding during automatic use.

M4 cut with M4 extension will be the best.
M4 cut with Rifle upper is suppose to be acceptable.

The extension is on the barrel.


So why do they sell extensions when they are already on the barrel you order?

So this barrel:

http://yankeehillmachine.com/store/product342.html

plus regular m4 upper should be good to go?


Link Posted: 9/9/2010 8:04:19 PM EDT
Guessing barrel extensions are for people making custom barrels?
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