LMT 40mm M203.  Designed to be mounted to any standard 1913 Picatinny rails.  Does not include barrel or sight.  Includes three recoil lugs and three locking lugs to hold to rail.  Built from 7075 T6 aluminum forging for durability.

Type 1 receiver, not classified as a Destructive Device until a barrel is mounted.  Must have ATF approval as a Destructive Device to mount a barrel.