The LMT MARS-L PDW Multi-Caliber Complete Lower Receiver (LMT Defense part no. M7DA4SH) is a factory-complete AR lower built for shooters running a Personal Defense Weapon-style upper in .204 Ruger, 5.56 NATO, or .300 Blackout. As part of LMT’s Modular Ambidextrous Rifle System, it carries fully ambidextrous controls and the fit-and-finish LMT is known for on its duty-grade rifles. Because it drops onto any mil-spec AR-15 upper, it’s a quick way to build out a lightweight, caliber-flexible PDW or SBR host without starting from a stripped receiver.

Key Specifications

• Configured as a fully complete lower receiver, ready to accept a compatible upper.
• Compatible with .204 Ruger, 5.56 NATO, and .300 Blackout uppers on the MARS-L platform.
• Built by LMT Defense, known for mil-spec ambidextrous AR rifle systems.
• Uses standard mil-spec AR-15 lower receiver dimensions for broad upper compatibility.

Frequently Asked Questions

Does this lower include a stock or brace?
It ships as a complete lower with fire control components and furniture installed; confirm current listing photos for the exact stock/brace configuration.

What calibers can I run on this lower?
It’s built for the MARS-L PDW platform and is compatible with .204 Ruger, 5.56 NATO, and .300 Blackout uppers.

Buy the LMT MARS-L PDW Multi-Caliber Complete Lower Receiver

Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL. Explore more LMT Defense firearms in our AR15 Lowers lineup.