I just recently picked up my barrel and assembled. 7mm Sherman Short Tactical, 27" heavy profile barrel, adjustable gas block, heavy 9.3oz buffer, Aero Precision enhanced upper and lower.
Hopefully I get the chance to run a few rounds over the labradar next weekend. Will load a few 180gr ELD-Ms. Won't have glass for a little while so can't work up a load yet.
These are fun rifles. I have the factory built DPMS 300 Saum. They did these with a 20" barrel and rifle length gas. Any longer and I'd definitely extend the gas system like Earnhardt said. I run a standard buffer but haven't tried any others.
I think the KAK bolt is a hp type with smaller diameter fp. Mine is not, and will pierce primers with bullets over 168's, even with non-max loads and cci 34 primers. So I stick with 168's and H4350 and it works well.
I made a single stack mag that holds 6 iirc and it works well. Pmags work for 3 or 4 and the same with some steel mags but mag bulge becomes an issue after 3 or 4 rounds.
