A frame mount adds weight forward of the trigger guard using the G45's full-size accessory rail, shifting balance toward the muzzle and reducing the rotation causing muzzle rise per shot. The G45 is the crossover Glock -- G17-length frame with G19-length slide -- and uses the full-size G17 rail. Less muzzle rise means faster sight return between shots and tighter split times, regardless of the specific Glock model.
Confirm compatibility on the individual product page before ordering.