02-01-2017, 03:32 AM
I haven't used one on a Grendel but we put one on my shooting partner's Colt Match HBar to tune it when he added a suppressor. Quality of manufacture and finish were outstanding and it was a breeze to tune for minimum recoil and reliable function and last round hold open. I was impressed with the design when I read about it after installation, tuning and many rounds down range we are absolutely satisfied with it. We chose the clamp type as opposed to the set screw models.