The M203 is a single-shot 40 mm under-barrel grenade launcher designed to attach to a rifle. It uses the same rounds as the older stand-alone M79 break-action grenade launcher, which utilizes the high-low propulsion system to keep recoil forces low.

Chambered in 40mm, LMT grenade launchers are globally recognized as the most reliable M203 platform in the industry. Large breech opening for the largest projectiles in a standalone platform. Available in multiple barrel length and mounting configurations.

M203 40mm rail mounted receiver. Designed to be used on any picatinny rail or as a stand alone weapon system. Machined from aerospace aluminum. Utilizes 9″ 40mm 1:48″ RH twist barrel. ATF approval required for destructive device.

Omaha Outdoors has custom and factory in stock LMT Defense M203 models for sale. Buy LMT Defense M203 online at Omaha Outdoors.

LMT 40mm M203. M16/M4 design under barrel mount M203 receiver with 9″ barrel. 1:48″ RH twist rifling. Receiver is made of aerospace aluminum. Does not include front mount or sight. ATF approval required for Destructive Device.

9″ complete barrel — the go-to for a M203 setup these days. Purchase this product now and earn 538 Sweatshop Cash! This LMT 40mm barrel assembly is one of the mainstays and go-to’s of the M203 family. This barrel is designed for use with L2B1 rail-mount or classic LMP300E under-barrel receivers.

40mm M203 with stand alone frame. Designed for original under mount style M203 receivers, this receiver allows a standard M203 to be used as a stand alone grenade launcher. Built out of aerospace aluminum and has a 9″ barrel with 1:48″ RH twist. Includes LMT SOPMOD stock, LMT ergonomic grip and leaf sight.

Experience the power and versatility of the 9″ STANDALONE CLASSIC M203, available for purchase at USA Reload. Whether you’re a law enforcement professional, a military operator, or a dedicated enthusiast, this firearm delivers superior firepower and precise grenade deployment.

Designed as a stand alone pistol grip weapon system it includes the LMT frame for rail mounted M203. Utilizes 9″ 40mm 1:48″ RH twist barrel. Built of aerospace aluminum it includes an LMT ergonomic grip. ATF approval required for destructive device.