AircTac/Monk/Combat Machine ESG build Airtac carbon upper with Airtac Hopup Pulsar D engine with Gate Titan II Monk ESG grip with STORM CAT5 reg (new gauge) Combat Machine lower/frame ATC dual mag release - I'm not familiar with the inner barrel or bucking to note Includes the Acetech tracer with matching carbon sleeve. It needs set screws to hold the sleeve to the tracer unit but works fine. All Pulsar paperwork, including PIN X3 Lancer Tactical M4 mags Will ship FREE CONUS! Perfect gift for the holidays.