LMT MARS-H MLK MWS Piston .308Win 16" Rifle The MARS-H MWS uses the patented MWS(Modular Weapon System) as previous generations but with updated M-LOK compatibility. This monolithic design is milled from a single aluminum forging and uses 2 locking bolts to secure the barrel extension. This patented system engages the barrel extension for a full 360 degrees and makes the barrel removable in seconds while featuring return to zero of the same barrel. The utilization of the MARS-H lower receiver offers advantages of ambidextrous controls with an EDM cut 2-stage trigger for precision shooting. An ergonomic grip and SOPMOD stock provides a positive cheek weld while offering battery storage. The piston system allows the action to run cleanly while running reliably.