I have a like new ( Except for one small blem on flute) 6.5 Grendel Ruger American Ranch Gen 2. I don't have the time to shoot like I used to with other gas guns. Gunsmith installed Griffin Armament taper mount brake but will supply the original brake as well. Rockset, so I didn't want to mess with it. I'll be throwing 200 rds of Hornady 123 gr SST ammo.