Designed with input from current and former professionals, the Aimpoint Patrol Rifle Optic utilizes a hard-anodized 30mm tube, with a battery life up to three years using a single lithium battery. The QRP2 mount includes a removable spacer that indexes the sight at the optimal height for co-witness with the standard iron sights on AR15/M16/M4 Carbine style weapons. This spacer can be removed to enable the use of the sight on police shotguns or sub-machineguns. The QRP2 mount also incorporates a torque-limiting twist knob that provides the optimal level of pressure on the rail while completely eliminating the possibility of over-tightening. The Aimpoint PRO features a two MOA red dot provides enhanced on target speed and increased first shot hit probability, front and rear flip up covers, night vision compatible, and recessed lenses to protect against damage.