LMT MARS-LS Complete Ambidextrous AR-15 Lower Receiver - Euro Two Stage AR Trigger

Manufactured by Lewis Machine & Tool
Manufactured by Lewis Machine & Tool
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Items that are regulated by the ATF have restrictions and requirements: 
•Your entire order will ship only to a Federal-Firearm License holder.
•Please contact your local FFL prior to placing your order to ensure they are still accepting transfers.
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to ffl@primaryarms.com.



Introducing the LMT MARS-LS, a complete lower receiver that redefines ambidextrous control and performance. Built with the innovative MARS® system, it boasts ambidextrous controls for the selector, magazine release, and even the bolt catch/release, ensuring seamless operation for both left and right-handed shooters.

Crafted from high-strength 7075 T6 aluminum and sporting a hard-coat anodized finish, the MARS-LS is built to withstand the rigors of any shooting environment. The enhanced magazine well promotes faster and more consistent reloads, while the two-stage Euro trigger group delivers crisp and predictable trigger pulls.

Note: LMT MWS lower receivers are only guaranteed compatible with LMT upper receivers. Any other brand may not fit or function correctly.


  • For use with LMT upper receivers
  • MARS System provides ambidextrous controls for selector, magazine release, and bolt catch/release
  • Forged 7075 T6 aluminum with hard-coat anodized finish for durability
  • Optimized magazine well for smooth and rapid feeding
  • Two-stage Euro trigger group for crisp and predictable trigger pulls
  • Winter trigger guard, Ergo grip, QD endplate, and SOPMOD buttstock
  • Pre-assembled with Mil-Spec parts for immediate use and reliable performance
  • Ambidextrous comfort for both left and right-handed shooters

Comfort and convenience are paramount. The ergonomic design features a winter trigger guard, Ergo grip, QD endplate, and SOPMOD buttstock, maximizing handling and control. Additionally, this lower receiver comes fully assembled with Mil-Spec parts for out-of-the-box performance.

Start your next AR-15 build with the LMT MARS-LS. Its design, superior craftsmanship, and focus on ergonomics make it an ideal choice for an upgraded set-up. Pair it with an LMT complete upper receiver for optimal fit and performance.

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BrandLewis Machine & Tool
Caliber Marking5.56 NATO
FinishHardcoat Anodized
Receiver Material7075-T6 Aluminum
Trigger Pin DiameterMIL-SPEC .154
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.

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