The do-it-all MARS-H has the robustness of a combat proven weapon system, the pedigree of an accurate long range rifle, and the versatility of LMT's MARS(TM) modular system. Featuring a 1/10 right hand twist, 16, chrome lined barrel, and two stage trigger, this carbine can shoot with precision for a long time. Utilizing the LMT(R) patented Monolithic Rail Platform, MRP(TM). The only true monolithic rail platform, milled from a single solid piece of aerospace aluminum forging. It utilizes two locking bolts accessible from the side of the receiver to lock in the barrel extension. This patented technology engages the barrel extension for a full 360 degrees around the extension and makes the barrel removable within seconds with a return to zero of the same barrel. One receiver can utilize numerous barrels of varying length, material, and caliber.