Trijicon ACOG Compact 1.5x16S Green 9mm RTR Riflescope

Pistol caliber carbines are close range guns, and 1.5 power respects that. The sight picture stays wide and fast, with just enough magnification to sort out a target at the back of a bay. What makes this ACOG different from a dot is the power source, or the lack of one. Fiber optics feed the reticle in daylight and adjust brightness to the conditions on their own; a tritium lamp keeps it glowing when the sun is gone.

The green RTR reticle here is laid out for 9mm, so the aiming references are laid out for a pistol round rather than a rifle cartridge. The ACOG body is built to be rugged and reliable. For a subgun or a 9mm carbine that has to work the instant it is picked up, there is no battery to fail.