GC_UPC PWS AR-15 MK116 MOD 2-M Long Stroke Gas Piston Upper Receiver Assembly 223 Wylde 16.1 Barrel M-Lok FSC556 - 340559" $1,299.95 2M116UA01-1F show more like this 14.25 MidwayUSA GC_UPC Primary Weapons Systems MK116 MOD2-M Upper Receiver, 16in bbl, .223 Wylde, 3-Setting Adjustable Gas System, FSC556 Compemsator, Black, 2M116UA01-1F $1,299.95 2M116UA011F show more like this Free Shipping on most orders over $49 Optics Planet GC_UPC Primary Weapons Mk116 Mod 2-M 223 Wylde Complete Upper Receiver - Mk116 Mod 2-M 223 Wylde 16.1" Bbl Complete Upper W/Fsc 556 $1,299.95 2M116UA01-1F show more like this additional Brownells GC_UPC Primary Weapons Systems MK116 MOD2-M Upper Receiver, 16in bbl, .223 Wylde, 3-Setting Adjustable Gas System, FSC556 Compemsator, Black, 2M116UA01-1F $1,299.95 2M116UA011F show more like this Dvor