The 12.5″ Midlength barrel has short dwell time with a purpose-driven gas port to create a very reliable, yet soft-shooting carbine. With an 11.5″ handguard, there is ample space for use with all of your accessories. LMT continues to provide their renown and patented Monolithic Rail Platform, MRP. Famous for being the only true monolithic rail platform and being milled from a single solid piece of aerospace aluminum forging, it utilizes two locking bolts to secure the barrel extension. This technology engages the barrel for a full 360 degrees around the extension for great heat dissipation and accuracy. It also makes the barrel removable within seconds with a return to zero of the same barrel. One receiver can utilize numerous barrels of varying length and calibers. At the heart of this rifle is LMT’s MRP barrel. They are cryogenically treated and chrome-lined for long-term durability and accuracy. These barrels utilize a low-profile gas block and a straight gas tube for longevity. The MARS-L lower receiver features truly ambidextrous controls for left-handed operation. While it comes with an ambidextrous safety and magazine release, it most notably includes an ambidextrous bolt release and bolt catch. Comes with an ergonomic textured G2 grip and enhanced trigger guard. As with all LMT lower receivers, the extension tube is coated with dry film lubricant.