LMT MARS-H DMR-ARCA 7.62x51mm Rifle 18" Barrel - 20 Rd

LMT MARS-H DMR-ARCA 7.62x51mm Rifle 18" Barrel - 20 Rd

Deliver devastating terminal ballistics and surgical semi-automatic precision with the LMT® Defense MRP-H 15.3″ M-LOK ARCA 18″ 7.62x51 DMR Rifle. Built around Lewis Machine & Tool’s patented Monolithic Rail Platform (MRP™), this battle-proven Designated Marksman Rifle (DMR) is CNC-machined from a single solid piece of aerospace-grade forged aluminum. By uniting the upper receiver and handguard into an unbroken monolithic structure, the MRP-H eliminates handguard deflection, ensures absolute zero retention for forward-mounted optics and lasers, and provides an ultra-rugged foundation engineered for harsh operational environments.

At the heart of this heavy-hitting platform is an 18-inch cryogenically treated stainless steel barrel chambered in 7.62x51mm NATO (.308 Win) with a fast 1:8″ RH twist to stabilize a broad spectrum of match-grade projectiles. The system utilizes LMT’s proprietary two-bolt quick-change barrel technology, allowing operators to change calibers and barrel lengths in seconds with verified return-to-zero. The 15.3-inch forend features an integrated rear ARCA rail section for rapid tripod lockup, surrounded by 7-sided M-LOK attachment slots and 22 inches of uninterrupted top Picatinny rail. Paired with the fully ambidextrous MARS-H lower receiver, an AXLE Precision two-stage trigger, and a micro-adjustable DMR stock, this rifle represents the apex of modern .308 precision marksmanship.

Features

Patented MRP™ Monolithic Upper Platform:
Milled from a single solid aerospace aluminum forging, creating an ultra-rigid chassis that eliminates handguard flex, preserves optical zero under load, and endures extreme combat use.

Two-Bolt Quick-Change Barrel System:
Secures the barrel extension with a 360-degree clamp via two side-accessible locking bolts, enabling lightning-fast barrel swaps and caliber conversions with guaranteed return-to-zero.

18″ Match Stainless Steel 7.62x51 Barrel:
Cryogenically treated and coated with LMT’s proprietary finish for superior thermal stability and extended service life, featuring a 1:8″ RH twist, a low-profile gas block, and a heavy-duty straight gas tube.

Integrated Rear ARCA Rail & M-LOK Forend:
Combines a continuous 22-inch 12 o'clock Picatinny rail with 7 sides of M-LOK accessory slots and a machined rear ARCA Swiss dovetail for seamless, direct-to-tripod positional shooting.

Fully Ambidextrous MARS-H DMR Lower:
Features mirrored, duty-grade ambidextrous controls—including bolt catch and release, magazine catch, and safety selector—mated to a dry-film lubricated receiver extension with a QD sling endplate.

LMT AXLE Precision Two-Stage Trigger:
Delivers an exceptionally smooth take-up followed by a clean, predictable break and crisp reset, ensuring precise trigger control during extended-range target engagements.

Micro-Adjustable Precision DMR Stock:
Equipped with integrated adjustment dials for fine-tuning comb height and length-of-pull (LOP), enabling a tailored cheek weld and perfect eye alignment behind high-magnification optics.

Specifications