I have been using this for a while. Today I had an ar10 out and after 150 or so rounds I noticed that while the front free floating handguard was still FIRMLY in the things grip the gun has slid backwards. So the thing was solidly holding onto the gun BUT only that particular part of the gun. I can easily fix this, of course, and did but is there anyway around this problem? I have also noticed that on some guns the point of aim or the group size change each time the gun is chucked up.
On a gun like the Ruger 450 Bushmaster or a Savage 338 Federal this thing REALLY reduced the felt recoil but here again the gun will slip back even though the handgun is still snugly held in place.
On really light guns like the Winchester Wildcat you can only use this thing as, basically, a shelf because here tightening this thing up moves and enlarges groups.