LMT MARS-L Forged Complete Compact Ambidextrous Lower Receiver – PDW
The MARS-L PDW lower receiver assembly is designed for compact weapons.
The LMT Modular Ambidextrous Rifle System (MARS) lower receiver offers ambidextrous controls to include: selector, magazine release and bolt catch and release. An 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.
This lower receiver is designed with several unique LMT features that lend itself to compact and PDW use. These features are: Two-stage trigger group, winter trigger guard, ergo grip, QD endplate, and PDW buffer system and PDW SOPMOD buttstock.
Features:
- Forged 7075 aluminum
- Hardcoat anodized
- Compatible with Mil-Spec AR-15 lower parts
- Precise tolerances


William S. (verified owner) –
Bought this for my PDW build. Waiting for Form1 approval to attach the LMT 300 Blackout 8.25″ combo I also purchased from Rooftop. Note: This complete lower comes with an extra part. Had to call LMT to find out where/when to use it. It’s an extra weight mini buffer that is inserted in the back of the BCG. I asked about the above build, and it’s not needed for that. When my LMT 10.5″ 5.56 barrel is installed, it’s used. Too bad LMT didn’t included any instruction for when and how to use it. That’s on LMT. No fault of Rooftop.