LMT Defense MARS-LS 5.56mm NATO AR-15 with MRP Monolithic Quad-Rail, 13.7 in Pinned/Welded to 16.5 in, Ambidextrous Controls
This LMT Defense MARS-LS combines the fully ambidextrous MARS-LS lower with LMT's one-piece MRP monolithic quad-rail upper. It features a 13.7 in barrel that is permanently pinned and welded to an overall legal 16.5 in barrel length, capped with a multi-port brake/compensator. Built from 7075-T6 aluminum and made in the USA, it is set up with continuous MIL-STD-1913 rail space and ships in excellent condition with a Lancer 30-round magazine.
Condition
Overall Condition: Excellent condition, showing only faint signs of any prior use or handling.
Bore Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
Specific Condition Notes: Minor scratches and small blemishes are present on exterior surfaces.
What's Included
- LMT Defense MARS-LS semi-automatic rifle, 5.56mm NATO
- One 30-round Lancer L5AWM polymer magazine with steel feed lips
The MARS-LS lower delivers fully ambidextrous controls, including a right-side bolt catch/release, ambidextrous safety selector, and ambidextrous magazine release. This setup caters to both left- and right-handed use without compromise on an AR-15 platform.
The upper is LMT's Monolithic Rail Platform (MRP), a one-piece 7075-T6 aluminum receiver/handguard with a quad-rail layout. It uses a quick-change barrel interface secured by two front cross-bolts and provides a continuous MIL-STD-1913 top rail with position indices labeled T2–T28, L18–L28, and R18–R44.
The barrel measures 13.7 in and is permanently pinned and welded to achieve an overall legal barrel length of approximately 16.5 in. A multi-port brake/compensator is pinned and welded in place, and the rifle operates via a semi-automatic, direct-impingement system.
Furniture includes a 6-position collapsible polymer stock with QD sling socket and adjustable length of pull, plus a rubberized, finger-grooved pistol grip. There are no iron sights or optics installed, and the continuous Picatinny rail space supports mounting of preferred sighting systems. Receiver markings include LMT DEFENSE, ELDRIDGE IA USA, MULTI-CAL, and MARS-LS, with patent markings US 8,234,806 B2, US 8,561,337 B2, and CA 2485710 present.