The LMT M203 2003 Rail Mounted Grenade Launcher 40MM with 9″ Barrel is a lightweight, single-shot, breech-loaded 40mm weapon specifically designed to be used on any picatinny rail or as a stand-alone weapon system.

It creates a versatile combination weapon system, capable of firing 5.56/223, 7.62/308, 6.8 SPC, 300 Blk, 243 Win and 6.5 Creedmoor ammunition as well as the complete range of 40MM high explosive and special purpose ammunition. A complete self-cocking firing mechanism, including barrel latch, trigger and positive safety lever is included in the receiver, which allows the M203 to be operated as a completely independent weapon even though attached to the weapon.