The LMT modular ambidextrous Rifle System (MARS ) lower receiver integrates ambidextrous controls, including the selector, magazine release and bolt catch and release. The receiver features an enhanced flared magazine well, along with ambidextrous magazine and bolt catch mechanisms, which are precision-machined directly into the receiver to optimize ergonomic functionality. This lower receiver incorporates several proprietary LMT features to augment its durability and versatility. These features include a two-stage trigger group, a winter trigger guard, an ergonomic grip, a QD endplate and a SOPMOD buttstock. The LMT DEFENSE Mars-L SOPMOD complete lower receiver is a combat-validated, fully ambidextrous lower receiver designed to optimize durability, functionality and modularity This premium complete lower receiver is engineered to accommodate .204 Ruger, 5.56x45mm and .300 AAC Blackout calibers, making it suitable for custom builds and professional applications