Mounts to any free-float handguard. Flip-up sight stays down out of the way when using optics, yet is easily flipped up. The sight is held in position with a spring detent. It does not lock in the up or down position so there are no buttons to push to deploy or store it, just flip it up or push it down.
The Black iron sight is the same one used on the MK12 Mod 1, the Taupe is the sight used on the MK18 rifle.
*Color varies from batch to batch on the Taupe sights.