View Full Version : M-4 upper and rifle receiver
javalos
03-14-2012, 12:00 PM
How is the feeding reliability of barrel with M-4 cut extension mated to a non-M-4 upper receiver? Thanks
Likely get hang-ups at the junction lip.
SamsDX
03-14-2012, 12:09 PM
http://www.ar15barrels.com/gfx/feedramps.jpg
M-4 barrel extension + standard receiver = ok (not bad, but not good).
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