The LMT MARS-L 12.5″ Specwar is a 5.56 NATO short-barreled rifle (SBR) built around Lewis Machine & Tool’s Monolithic Rail Platform (MRP) upper receiver. The upper receiver and handguard are machined from a single aluminum forging, creating a continuous top rail and integrated M-LOK mounting surfaces for accessories. The rifle features a 12.5-inch barrel with a midlength gas system paired with an 11.5-inch handguard, providing rail space for optics, lights, and other accessories while maintaining a compact overall configuration.
The rifle is equipped with the LMT MARS-L ambidextrous lower receiver, which incorporates ambidextrous controls for the magazine release, bolt catch, and bolt release. The platform also includes a chrome-lined 1:7 twist barrel, a full-auto profile M16 bolt carrier group, and an AXLE two-stage trigger. Additional features include an LMT SOPMOD stock, G2 pistol grip, and A2 flash hider, along with a continuous Picatinny top rail and multiple M-LOK attachment points for accessories.
Specifications
- Caliber: 5.56 NATO / .223 Remington
- Barrel Length: 12.5″
- Twist Rate: 1:7
- Gas System: Midlength
- Upper Receiver: LMT MRP Monolithic Upper Receiver
- Handguard Length: 11.5″ M-LOK rail
- Lower Receiver: LMT MARS-L Forged Ambidextrous Lower
- Trigger: LMT AXLE Two-Stage Semi-Auto Trigger
- Finish: Black Anodized
- Included Accessories: One magazine, owner’s manual
