For training Tuesday, we are talking about the mounting of optics to Army weapons. Specifically, we are addressing the mounting of the M150 Rifle Combat Optic to the M4A1. The reference for this discussion is M150 RCO TM 9-1240-416-13&P and CCO TM 9-1240-413-13&P.
The first thing that the Paratrooper should do is check the eye relief for the optic. This is especially important when mounting magnifying optics to the weapon, as eye relief (the distance from the eye to the optic to get an optimal sight picture) is essential for the consistent application of the shot process. To do this, place the optic on the rail first, then check the rail location until you have minimal ‘scope shadow’ around the edge of the optic.
Once that’s done, it’s important to make sure the optic is secured properly to the rail. This is done by applying forward pressure on the rail while tightening the rail mount. For the CCO, its 2 clicks on the torque limiting knob. For the RCO, it’s following the procedures outlined in the TM and this video below.
Mounting your optics properly ensures you retain the zero while it’s mounted to the weapon, and increases the probability of zero retention when the optic is removed and remounted.