How to ID M4 feed ramps?

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[ARCHIVED THREAD] - How to ID M4 feed ramps?

Posted: 4/15/2006 5:55:46 AM EDT

Is there anywhere I can view pictures of an M4 barrel extension/receiver and a standard rifle barrel extension/receiver?

I am having a hrad time discerning between the 2. The upper in question started life as an M&A M4 upper that I rebarreled with an M4 barrel from J&T when the ban ended. Do J&T M4 barrels have M 4 cuts?

Thanks

Posted: 4/15/2006 6:49:00 AM EDT

[#1]

Standard barrel extention ramps are cut at 45°. M4 ramps are cut at a steeper 52° and extend into the upper receiver.

Posted: 4/15/2006 7:10:48 AM EDT

[#2]

The Colt M4 barrel extension also has a "4" stamped in the 3 o'clock position.

Posted: 4/15/2006 9:35:54 AM EDT

[#3]

Guess my S&W m4orgery doesn't really have an M4 barrel since it doesn't
have the 4.
JR

Posted: 4/15/2006 11:24:52 AM EDT

[#4]

Thanks guys. That answered all my questions. Appreciate it.

Posted: 4/16/2006 3:09:26 AM EDT

[#5]

Silly question time... why would you want M-4 feed ramps?

Posted: 4/16/2006 3:21:05 AM EDT

[#6]

Quoted:
Silly question time... why would you want M-4 feed ramps?

More reliable feeding. There have been a ton of threads on M4 ramps, look back through the AR section and you're bound to find some of them. They'll give you more info than I can think of now because I'm about ready to fall asleep.

Good luck on your search.