The LMT Defense MARS-L SOPMOD Complete Lower (brand part no. R-M7DA4) is a fully assembled AR-15 lower receiver from Lewis Machine and Tool’s Modular Ambidextrous Rifle System. Like every LMT lower it is machined from a single piece of 7075 T6 forged aluminum, and the ambidextrous selector, magazine release and bolt catch and release are built directly into the receiver. It comes finished with a two-stage trigger group, winter trigger guard, ergo grip, QD endplate and SOPMOD buttstock, so a compatible upper is all it needs to become a working rifle. Builders who want a ready-to-run LMT Defense lower will find the work already done.

Key Specifications

• The controls are fully ambidextrous, with the selector, magazine release and bolt catch and release usable from either side of the receiver.
• The magazine well is enhanced and flared, which guides the magazine in faster during reloads.
• The trigger is a two-stage trigger group, giving a defined take-up before a clean break.
• The trigger guard is a winter trigger guard, with room for a gloved finger.
• The pistol grip is an LMT ergo grip, shaped for a comfortable hold during extended shooting.
• The rear of the receiver carries a QD endplate, giving a quick-detach point for a sling.
• The buttstock is a SOPMOD stock, an adjustable stock that is installed and ready to use.

Frequently Asked Questions

What does this lower come with? It comes complete with the two-stage trigger group, winter trigger guard, ergo grip, QD endplate and SOPMOD buttstock already installed.

Which calibers can I build on it? LMT lists the lower for 5.56x45mm and .300 BLK, and it weighs about 1.7 pounds as supplied.

Buy the LMT Defense MARS-L SOPMOD Complete AR-15 Lower

A complete lower with ambidextrous controls saves the cost and time of sourcing each part separately. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and browse more AR-15 lowers for your next build.