This review of the Primary Weapons Systems MK116 PRO upper assembly highlights its long-stroke gas piston system, adjustable gas block for suppressor use, and 223 Wylde chambering. The presenter, with experience testing PWS products, notes its smooth operation, robust construction, and compatibility with various ammunition types. While praising its ergonomic design and user interface, a minor drawback mentioned is the lack of integrated QD sling mount points on the rail.
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