If you saw my What I translated KISS into thread, you'll know the gun I speak of. Heres the parts so if you didnt see it you'll know whats on it:
BCM BCG
Bushmaster 16in 1/9 cut down to 10.5
Bushmaster A2 gas block
Bushmaster Upper/Lower
BRAND NEW Gas Tube(BravoCompanyUSA)
The issues Im having are as follows:
Will NOT extract/cycle with Wolf 75gr(wasn't surprised)
Will extract with 55gr Hornady Soft Point, but WILL NOT pick up and chamber the next round
Will cycle 100% with hand loaded Hornady 75gr BTHP ammo
Will cycle 95% with XM193
Basically what it comes down to is everything but Wolf ammo will allow the gun to extract, but not everything will allow the gun to chamber the next round.
I tried 5 different mags. 3 different 30rd PMags, 1 GI 20rd mag, 1 GI 30rd mag.
I tried both a Carbine Buffer and a H2 Buffer(all I have to use), and replacing the buffer spring with a brand new one(old one was actually 1/4 of an inch more compressed than new one). Replacing the spring and using the H2 seems to help a little with the XM193, but still does not work.
I will say the following. The barrel before it was cut down from 16 to 10.5 was used as part of a Piston gun build. Was having the same issues, but I thought it was the piston kit.
Im wondering if the chamber is not messed up, causing the extraction issues, but Im clueless on the not picking up the next round.

