USM4 American Made Mil Spec Quality

USM4 Special Forces lower receivers are machined from 7075-T6 billet aluminum, bead blasted then hard anodized. Our close tolerances ensure a firearm with virtually no play between the upper and lower receivers.

Every USM4 Special Forces lower receiver is 100% made in the USA, completely Mil-Spec, and fully endorsed by US Special Forces Association.

A financial contribution is made to Special Forces veteran service organizations with the purchase any USM4 Special Forces lower receiver or pre-built USM4 Special Forces firearm.