LMT MARS-L Forged Stripped Ambidextrous Lower Receiver
The Lewis Machine and Tool MARS-L stripped lower receiver is an excellent starting point for a hard-use rifle.
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 “stripped” version comes only with the ambidextrous components installed.
Features:
- Forged 7075 aluminum
- Hardcoat anodized
- Compatible with Mil-Spec AR-15 lower parts
- Precise tolerances




Ehsan (verified owner) –
Sol literally messaged me the same day he got his hands on one after I messaged him asking when they’re coming back in stock. Dudes got great customer service, I’ll be coming back to buy from him.
Kc a. (verified owner) –
Rooftop is ALWAYS top tier in terms of C/S.
Can’t go wrong with these lowers, they’re my go-to.
Elvis N. (verified owner) –
best ar ambi lower
Andrew B. (verified owner) –
This is an excellent lower from one of the best manufacturers in the business. These lowers are fully ambidextrous (once completed), and are at the top of the heap.
Rooftop Defense is quickly becoming my go to for parts and accessories. Thank you very much for the quick shipping, and the Ramen!
Joshua H. (verified owner) –
Authentic LMT at a great price! Crazy fast Sweatshop shipping. I was amazed how fast my LMT lower shipped after the FFL sent their info. Plenty of time to enjoy my the Ramen before I start my project. Thanks again Rooftop Defense!