Upgrade your MCR rifle setup with the Fightlite Industries MCR AR15 M16 M4 Magazine Adapter. Crafted from durable aluminum this complete barrel assembly is designed for seamless integration with MCR rifles and upper receiver assemblies. It features a fixed headspace gas block assembly a versatile 4-position regulator piston and a reliable flash hider. The dovetail cover ensures added protection and functionality all proudly made in the USA. Enhance your firearm with precision engineering and robust materials for superior performance on the field.