Q: are any of the 6.5 grendel piston uppers full auto rated
A: All of our piston uppers can run full-auto. All the piston bolt carriers are full-auto bolt carriers so if one has a full-auto lower it will run full-auto. We run all our piston uppers on full-auto lowers and we have done a couple of piston uppers for customers who have had preban full-auto lowers.
Q: Very interested in the 6.5 Gas Piston Upper but very curious about the 1:8 twist rate when 1:7 or faster! is recommended for weights 80 Gr. and higher, in the 5.56x45MM offerings, is there enough difference in projectile to negate the physics of the findings?
A: A 1/8 twist is the most common twist for Grendel because it offers the best accuracy with the most common bullets. Also the 1/8 twist is the most common twist for match-grade barrels.