The PWS UXR features a Barrel Xchange System: An innovative barrel exchange system enabling users to switch between calibers and barrel lengths; Modified Long Stroke Piston System; Bore Evacuator; ambidextrous receiver & buttstock, folding buttstock with cheek and LOP adjustments. Configurable to either left or right-side folding. Mounted using an industry standard 1913 picatinny rail attached to the trigger housing; three position adjustable gas system including a dedicated suppressor setting; PWS FRC compensator; M-LOK handguard; Pin and Welded FRC Compensator, the extended FRC compensator is pin/welded to the barrel.