Okay, back from the dead...
I replaced the barrel with a DD cut-rifled barrel from Brownell's. Everything is working great now that ADCO has tuned the gas system (see my related thread).
The old barrel looked like it had a messed up crown, so I had a local gunsmith rethread and recrown it. I installed this on a gun I built from leftover parts (that was fun). Unfortunately, it's still keyholing with the Brown Bear ammo. Shoots Tula, Federal, and Lake City ammo just fine. I am pretty sure this is a 1/9 twist (based on what a DPMS tech told me; I bought the gun secondhand as a police trade-in).
At this point, I think I'm just going to junk the barrel, but I figured I'd see if anyone had any further advice. I do intend to take the barrel to a 'smith and have the chamber/throat checked.


Reply With Quote

Bookmarks