Aimpoint pro patrol rifle optic » 

Once you click it three times it is set, and very secure.
Red dot sight is a reliable reticle to focus upon the target and to get
the wonderful success rate in hits even on the moving targets.

Engraved gun screws are very expensive to repair and the incorrect sized blade can very quickly
cam out of the screw in question and may damage the gun screw or the finish on the gun.