MLC UPPER RECEIVER - AMBIDEXTROUS CHARGING HANDLE S-A Piston Bolt Carrier Group | MARS-L Lower Receiver  16″ 5.56×45 NATO Chrome Lined 1:7″ RH Twist Piston Barrel

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.For users who prefer the Piston Driven System, for increased reliability in any environment and climate, desert included

Selected by Army of New Zealand as new service rifle, after rigorous test and trials, against models form almost and western world factory.