The LMT MARS-H Battle Rifle (brand part no. MLKMWSB-MARS) is a 7.62x51mm NATO rifle built on Lewis Machine and Tool’s monolithic upper, wearing a 13.5-inch chrome-lined barrel with the flash hider pinned and welded to reach a permanent 16-inch length. That construction gives a shooter the handling of a short barrel with none of the paperwork, because the permanently attached muzzle device puts the rifle over the federal threshold. LMT Defense pairs it with the fully ambidextrous MARS lower, which is the feature the rifle is actually named for and the reason left-handed shooters gravitate to it. The MRP monolithic rail is machined from a single aluminum forging, and barrels swap out in seconds with a return to zero. This is a duty-grade .30-caliber semi-automatic, priced and built accordingly.

Key Specifications

• Chambered in 7.62x51mm NATO, the service-pressure designation this rifle is built and proofed around.
• The 13.5-inch chrome-lined barrel carries a pinned and welded LMT three-prong flash hider that brings permanent length to 16 inches, so no tax stamp is required.
• A 1:10 right-hand twist stabilizes the heavier .30-caliber match and service bullets shooters typically run.
• The MRP monolithic rail platform is milled from one solid aerospace aluminum forging rather than assembled from separate upper and rail pieces.
• A quick-change barrel system uses two side-accessible locking bolts and returns the same barrel to zero on reinstallation.
• The fully ambidextrous MARS lower receiver mirrors every control, which is the feature the model is named for.
• A two-stage trigger gives a defined take-up and a clean break for precision work at distance.
• The SOPMOD buttstock offers length-of-pull adjustment and a stable cheek weld.
• An Ergo pistol grip fills the palm better than a standard A2 grip under recoil.
• One 20-round magazine ships with the rifle.

Frequently Asked Questions

Does the 13.5-inch barrel make this an NFA item? No. The three-prong flash hider is pinned and welded, giving a permanent barrel length of 16 inches, so the rifle transfers as an ordinary Title I firearm with no tax stamp.

Can the barrel be changed? Yes. The MRP platform uses two side-accessible locking bolts, and the same barrel returns to zero when reinstalled.

Is the rifle genuinely ambidextrous? Yes. The MARS lower mirrors the controls for left-handed and right-handed operation, which is what the MARS designation refers to.

Buy the LMT MARS-H Battle Rifle

LMT builds to a military standard and prices accordingly, and the MARS-H is where that shows most clearly in a .30-caliber semi-automatic. The pinned 13.5-inch configuration is the sweet spot for anyone who wants a handy 7.62 without an ATF application attached to it. Order it from our Lubbock, Texas gun shop among our AR rifles and it ships fast and insured to your FFL.