Pretty good - Kinetic Development Group SIDELOK Universal Scope Riser

Excellent design and execution. Extremely easy and quick on and off the pic rail almost too easy. I would prefer more solidity. But I trust no manufacturer's claims of return to zero on any QR scope mount. This is small but handled a medium large Vortex 4-12 scope with heavy steel rings on an M4 Carbine. Shooting, removing, remount produced a drop 0f 1-2 MOA in elevation. Better than I expected. Acceptable for large targets to medium range if nothing is at stake or you have low standards for accuracy. May shoot in after awhile and eliminate some of the little variation. I compare it to my US Optics $400 QR mount with integral rings on a SCAR 17 and my German Sauer swing off mounts on a Sauer 30-06 bolt action, both perfection in machining. Both are superior to this and still require checking zero. I accept absolutely no zero shift but how hard is adjusting zero? Not very. For the price this is a very handy mount.