The LMT MARS-L 12″ Shovelnose is a 5.56 NATO short-barreled rifle (SBR) built around the LMT Monolithic Rail Platform (MRP) and a short-stroke gas piston operating system. The upper receiver and handguard are machined from a single aluminum forging, creating a rigid monolithic chassis with a continuous 1913 Picatinny top rail and multiple M-LOK attachment points for accessories. The rifle features a 12-inch piston-driven barrel with a two-position adjustable gas system, allowing users to configure the rifle for different ammunition types or suppressed and unsuppressed operation.

This model includes the LMT MARS-L forged ambidextrous lower receiver, which incorporates ambidextrous controls for the safety, magazine release, bolt catch, and bolt release. The platform also utilizes an MRP quick-disconnect barrel system, enabling compatible barrels to be swapped using the receiver’s dual locking bolts. Additional features include a chrome-lined 1:7 twist barrel, enhanced piston bolt carrier group, AXLE two-stage trigger, SOPMOD stock, and M-LOK Shovelnose upper receiver chassis.

Specifications

• Caliber: 5.56 NATO / .223 Remington
• Barrel Length: 12″
• Twist Rate: 1:7
• Operating System: Short-stroke gas piston
• Gas Adjustment: Two-position adjustable gas system
• Upper Receiver: LMT Shovelnose Monolithic MRP Upper
• Handguard Length: 11.5″ M-LOK rail
• Bolt Carrier Group: Enhanced Full-Auto Piston BCG
• Bolt: Piston-compatible bolt
• Charging Handle: LMT Ambidextrous Charging Handle
• Finish: Black Anodized
• Included Accessories: One magazine, owner’s manual

At a glance