The LEWIS MACHINE CO MARS-LS rifle is designed for precision and versatility. Its 16" barrel is chrome-lined and features a 1:7" RH twist, making it suitable for .223 Remington and 5.56 NATO rounds. The direct impingement operating system provides reliable performance. The rifle's upper receiver boasts the LMT Monolithic Rail Platform, allowing for easy mounting of accessories. A 30-round magazine is included, and the ambidextrous safety and mag release make it accessible to left- and right-handed shooters. Fast shipping ensures you can get your hands on this rifle quickly. Key Benefits and Features: Caliber: .223 Remington/5.56 NATO Operating System: Direct Impingement Barrel Length: 16" Barrel Twist: 1:7" RH Bolt Carrier Group: S-A BCG Upper Receiver: LMT Monolithic Rail Platform Lower Receiver: MARS-L lower receiver Capacity: (1) 30rd magazine Controls: Ambi Safety, mag release and slide catch