Non-Folding Lower Receivers

Complete AR-15 lower receiver built on the Shield Arms SA-4 7075-T6 billet lower receiver. Upgraded with Nickel PTFE Trigger, B5 Systems BRAVO Stock, and B5 Systems Type 23 Pistol Grip. Features upper tension screw, threaded bolt catch pin, and beveled mag well. CNC machined in Bigfork, Montana. Lifetime warranty.

The Shield Arms Mil-Standard Complete SA-4 Non-Folding Lower is a fully assembled AR-15 lower receiver built on the SA-4 billet lower receiver, and equipped with a mil-spec trigger group, A2 grip, A2 stock, and mil-spec safety selector. Features a built-in upper tension screw and threaded bolt catch pin with hardware included. Marked MULTI. Ready to accept any mil-spec AR-15 upper receiver. Made in Bigfork, Montana. Lifetime warranty.

Complete AR-15 lower receiver built on the Shield Arms SA-4 7075-T6 billet lower receiver. Equipped with Match Nickel PTFE Trigger, Radian Weapons Talon Ambidextrous Safety Selector, B5 Systems BRAVO Stock, and B5 Systems Type 23 Pistol Grip. Features upper tension screw, threaded bolt catch pin, and beveled mag well. CNC machined in Bigfork, Montana. Lifetime warranty.

The SA-4 Non-Folding Stripped Billet Lower Receiver is CNC-machined from 7075-T6 aircraft-grade aluminum billet to mil-spec dimensions and finished to Mil 8625 Type 3 Class 2 hard-coat anodizing. Builder-friendly features include a threaded bolt catch pin and built-in upper tension screw—hardware included. Marked MULTI. Compatible with standard mil-spec AR-15 lower parts kits and the majority of aftermarket components. Made in Bigfork, Montana. Lifetime warranty.