Geissele Automatics 05-405S: The AR-15/M4 Super Precision series of scope mounts are optimized for use with an AR-15/M4 upper. The mounting surface spans 7 picatinny sections and utilizes 4 shear lugs. These mounts use Geissele\'s update of the classic nut and bolt method for clamping the mount to the picatinny rail, which is the most secure method of attaching your scope to your weapon. Each nut and bolt combination provides 1,400 pounds of clamping force, much more than any lever mounting arrangement.