About the Primary Weapons Systems MK1

This complete lower receiver from Primary Weapons Systems features a forged 7075-T6 aluminum construction and an anodized finish. It includes a PWS enhanced buffer tube with an anti-tilt feature and a ratcheting castle nut. The receiver also comes equipped with an ambidextrous safety selector and a PWS enhanced trigger guard.

This lower receiver is the foundation for an AR-15 rifle. It is used to assemble a firearm for various applications, including recreational shooting at the range, home defense, or hunting, depending on the upper receiver and accessories chosen.