The LMT MARS-L 5.56 MRP 16″ is a semi-automatic rifle built around LMT’s patented Monolithic Rail Platform (MRP™) upper receiver. Machined from a single aerospace-grade aluminum forging, the MRP design uses two side-access locking bolts to secure the barrel extension with full 360-degree engagement, allowing for barrel changes when properly configured. This model features a 16-inch chrome-lined 5.56×45mm (.223) barrel with a 1:7″ right-hand twist and direct impingement operating system. The upper receiver provides 18.5 inches of uninterrupted 1913 Picatinny rail at the 12 o’clock position, with M-LOK® attachment points on the remaining sides.
The rifle incorporates the MARS-L Lower Receiver with fully ambidextrous controls, including bolt catch, magazine catch, and safety selector. Additional components include an ambidextrous charging handle, semi-automatic bolt carrier group, two-stage trigger, LMT ergonomic textured grip, and SOPMOD stock. The barrel assembly utilizes a low-profile gas block, straight gas tube, proprietary coating, and cryogenic treatment. The rifle ships with three grip panels, one magazine, and owner’s manual.
Specifications:
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Caliber: 5.56×45mm NATO / .223
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Barrel Length: 16″
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Barrel Material: Chromoly (chrome-lined)
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Twist Rate: 1:7″ RH
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Operating Method: Direct impingement
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Upper Receiver: Monolithic Rail Platform (MRP™)
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Top Rail: 18.5″ 1913 Picatinny
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Attachment System: M-LOK® compatible
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Lower Receiver: MARS-L ambidextrous
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Trigger: Two-stage
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