The LMT Modular Ambidextrous Rifle System (MARS) M7SL lower receiver offers ambidextrous controls to include the safety selector, magazine release and bolt catch and release. The enhanced flared magazine well and ambidextrous magazine and bolt catch mechanisms are machined directly into the receiver and have been designed to function as ergonomically as possible. The stripped variant ships with all proprietary controls already installed. The manufacture's part number is M7SL Specifications Manufacturer: LMT Defense Model: MARS-L Stripped Caliber: