LMT MARS-LS Stripped Lower Receiver

LMT MARS-LS Stripped Lower Receiver

The Lewis Machine & Tool MARS-LS Stripped Lower Receiver is a high-performance AR-15 foundation engineered for builders who demand precision, modularity, and fully integrated ambidextrous control. Built on the advanced Modular Ambidextrous Rifle System (MARS-L), this stripped lower delivers factory-machined bilateral functionality while giving you complete freedom to customize the remaining components of your rifle build.

Featuring integrated ambidextrous controls—including the selector, magazine release, and bolt catch/release—this receiver is designed for intuitive operation from either side, improving speed and adaptability in dynamic shooting environments. The enhanced flared magazine well further streamlines reloads, ensuring smoother magazine insertion under pressure.

As a stripped configuration, the MARS-LS provides a versatile foundation for custom AR-15 builds, allowing users to select their preferred trigger system, stock assembly, and lower parts kit. Compatible with AR-15 pattern upper receivers chambered in 5.56 NATO, .223 Remington, and .300 AAC Blackout, this receiver blends professional-grade engineering with full build flexibility.

Integrated Ambidextrous Control System
Factory-machined selector, magazine release, and bolt catch/release provide fast, intuitive operation from either hand.

Enhanced Flared Magazine Well
Improves magazine guidance and reload speed, reducing friction during high-pressure transitions.

Stripped Builder-Friendly Configuration
Arrives without fire control group or stock assembly, giving full customization control over internal components.

Precision-Machined Receiver Design
Clean, tight-tolerance construction ensures reliable fitment with AR-15 pattern components.

Multi-Caliber Compatibility
Supports 5.56 NATO, .223 Remington, and .300 AAC Blackout upper receiver configurations.

Specifications

• Caliber Compatibility: 5.56 NATO / .223 Remington / .300 AAC Blackout
• Platform: AR-15 Pattern
• Lower Receiver Type: MARS-L (Modular Ambidextrous Rifle System)
• Controls: Fully Ambidextrous (Selector, Magazine Release, Bolt Catch, Bolt Release)
• Magazine Well: Enhanced Flared Design
• Weight: 1.718 lbs
• Dimensions: 15.75 × 2.75 in