The LMT modular ambidextrous Rifle System (MARS ) lower receiver integrates ambidextrous controls, including the selector, magazine release and bolt catch and release. The enhanced flared magazine well, along with the ambidextrous magazine and bolt catch mechanisms, are precision-machined directly into the receiver to optimize ergonomic functionality. This lower receiver incorporates several distinctive LMT features to augment its durability and versatility, such as a two-stage trigger group, winter trigger guard, ergonomic grip, QD endplate and PDW buttstock. The LMT modular ambidextrous Rifle System (MARS) lower receiver provides ergonomic improvements, robust construction and operational versatility The LMT DEFENSE Mars-L PDW complete lower receiver is engineered for optimal performance and features a fully ambidextrous design It is specifically crafted for AR platform rifles compatible with .204 Ruger, 5.56x45mm and .300 AAC Blackout calibers