06-18-2011, 04:42 PM
The AA actual grendel bolt face is 0.011" deeper than the standard 7.62x39's bolt face. When I bought my bbl from CSS/LW a few years ago, they were only chambering their bbls to use the standard depth bolt face of the 7.62x39. You wouldn't be able to chamber a round in a Grendel spec'd bbl using a 7.62x39 bolt. If I tried to use a Grendel spec'd bolt in my CSS, I'd have extremely excessive headspace.
