There's a bolt coming up from the bottom of the grip with a sharp point on it, which engages with the teeth provided for grip rake angle adjustment on the frame. The Center can be shot quite well. At best I managed about 500 out of 600 with one as a novice 10 metre air pistol shooter, graduating to a Baikal 46m to take me up into the 550 range. For a springer that's pretty good, especially considering there's no recoil damping built in such as what one finds in the Diana M6 or model 10. Quite a gentle shooter really.