AR-15 SD Mod 4 9mm Upper Receiver 4in M-LOK Complete - SD Mod 4 9mm Upper Receiver 4in M-LOK Complete Black

Stern Defense

Resumen

The Stern Defense SD Mod 4 9mm Upper Receiver is a complete assembly designed for the AR-9 platform, featuring a compact 4-inch barrel that makes it ideal for close-quarters applications. Its design allows for effective performance with 9mm ammunition, providing a reliable upper for builders focusing on maneuverability and control. This upper receiver is commonly found in pistol-caliber carbine builds, where versatility and rapid handling are key.