Wont lock back on empty magazine with overgassed upper
Im not getting a lock back on an empty mag with an overgassed upper. It happens when I use my older (about 4 years old) PMAGs. Works ok with newer mags. The rifle ejects about 2 oclock with brass cased ammo, 3 oclock with steel cased.
I swapped out the upper with a well gassed upper that ejects at 3-4:30 with brass and 5 oclock with steel cased. Still using the same lower, same mag, the only thing that changed was the complete upper, and the it locked back every single time.
Im guessing the bcg velocity is too fast for the worn out magazine?
Im gonna try a full auto bcg and a heavier buffer next time and see if that makes a difference.
Wont lock back on empty magazine with overgassed upper
Current spec is an H buffer about 3.8 oz. I used a BRT insert to cure the same problem you are describing. Well gassed guns are glorious!
https://www.instagram.com/p/CIjxmThp...=19urqshx1b8gm
Unless you are controlling the gas at the source various and sundry other parts are at play.
ETA: H buffers are what I’m getting in my 6920s, sorry for the confusion.
#prettysurethatsbroken