The One Horse AR15 Complete Lower Receiver comes fully assembled and function-tested, built on a forged 7075-T6 hardcoat anodized receiver ready to run the moment it hits the bench. It features a mil-spec buffer tube setup, a One Horse M4 six-position adjustable stock, a crisp single-stage trigger, an A2 grip, and all small parts installed. Drop it onto any mil-spec upper and it is ready to roll. Made in the USA Forged 7075-T6 aluminum receiver Hardcoat anodized finish Fully assembled and function-tested Mil-spec buffer tube setup One Horse M4 six-position adjustable stock A2 pistol grip Crisp single-stage trigger All small parts installed Compatible with any mil-spec upper