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Posted: 4/15/2006 4:55:46 AM EST
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?

Link Posted: 4/15/2006 5:49:00 AM EST
[Last Edit: 4/15/2006 5:53:19 AM EST by Thunderbolt882]
Standard barrel extention ramps are cut at 45°. M4 ramps are cut at a steeper 52° and extend into the upper receiver.
Link Posted: 4/15/2006 6:10:48 AM EST
[Last Edit: 4/16/2006 7:56:43 AM EST by Molon]
The Colt M4 barrel extension also has a "4" stamped in the 3 o'clock position.

Link Posted: 4/15/2006 8:35:54 AM EST
Guess my S&W m4orgery doesn't really have an M4 barrel since it doesn't
have the 4.
Link Posted: 4/15/2006 10:24:52 AM EST
Thanks guys. That answered all my questions. Appreciate it.
Link Posted: 4/16/2006 2:09:26 AM EST
Silly question time... why would you want M-4 feed ramps?
Link Posted: 4/16/2006 2:21:05 AM EST

Originally Posted By atriusofbricia:
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.
Link Posted: 4/16/2006 3:54:39 AM EST
Roger that. Thanks much.
Link Posted: 4/16/2006 4:35:43 AM EST
Colt does the "4". There are others out there selling "to spec" M4 type extensions without the "4". Key words - "to spec".
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