Complete barrel assembly for use with MCR� rifles and upper receiver assemblies. Includes barrel extension with fixed headspace gas block assembly 4 position regulator piston flash hider front sight assembly (part number 15090) and carry handle assembly (part number 15035). 100% Made In USA. - 5.56 NATO chamber - Length: 16.25 - Heavy Profile for Sustained Fire Use - Thread Pitch: 1/2-28 TPI - Twist: 1:7 RHT - Mid-Length Gas System - 4 Position Adjustable Regulator - Mag Phosphate Finish - Front Sight Assembly (Part number 15090) - QC Barrel Handle Assy (Part number 15035) - Works with MCR and Shrike 5.56 rifles and upper receiver assemblies. - Made In USA