Two sighting systems, one rail. The C3XP gives you 3x magnification for distance plus a built-in 45° offset RMSc mount for a micro red dot up close. Roll the rifle and you are straight onto a 1x dot, with no extra mount to buy. 3x Micro Prism Scope & Integrated Offset Red Dot System A 3x prism scope with a built-in 45° offset RMSc mount