LMT 40mm M203. Built to be mounted to any regular 1913 Picatinny rails. Isn't going to incorporate barrel or sight. Consists of 3 recoil lugs and a few locking lugs to carry to rail. Created from 7075 T6 aluminum forging for toughness. The rifle was meant to be carried, preserved https://annek023tiv4.wikihearsay.com/user