NcSTAR NC Star MARFSV2, AR15 3/4" Riser Gen2, Short, Black Improved 3/4" Picatinny rail riser 1.9" long is Picatinny/MIL-STD 1913 profile and is lighter than the previous generation Works on AR15/M4 platforms as well as any other firearms platforms with a Weaver/Picatinny/MIL-STD 1913 rail This riser helps with getting low mounted optics and raising the optic up another 3/4 of an inch to a more comfortable cheek rest and Shooting height