A5 with mid and carbine gas
Did some testing today with prvi 5.56 and older black follower Pmags
lower is a Mega with A5 extension, buffer and spring from kit form.
A T-1 was used on both also.
1st upper was BCM 16" midlength with BCM BCG and A2 FH
function was fine, bolt did not lock back, several attempts were made
2nd upper was a complete Colt 6920 upper cut to 14.5" with pinned Vortex function was fine, bolt DID lock back everytime.
I found the Colt carbine gas /A5 to be noticeably softer shooting and less muzzle rise than the mid. Follow up shot groups were also much tighter with the carbine.
What is the reason for the Carbine shooting softer? The Vortex?
Why is the bolt not locking back on the Mid? Buffer to heavy?
Thanks