I shoot several AR-15s/AR-10s and M-14s. I just replaced my barrel on the AR-10T with a Krieger Mweight fluted 26". The rifle will not extract/eject spent cases. It looks like the bolt just barely manages to start unlocking but doesn't. Rifle was working fine with old barrel just that the group size was opening up after about 15,000 rnds, yes I shoot alot. I have checked everything from gastube alignment to ensuring that the gas port was drilled all the way through the top of the barrel. I can't figure this out at all. Any suggestions?