Universal, specially designed fire selector mounting screw for all AK compatible airsoft guns. The design of the mounting screw is designed so that it is easy to tighten the fire selector, it moves smoothly and it does not loosen during use. The head of the tightening screw is made of CNC machined EN AW 7075 aluminum. The screw can be tightened with a hex, torx, or flat screwdriver.