Stern Defense 9mm Upper 4in Melonite Barrel 1 to 10 Twist MLOK AR15 PCC

The Stern Defense STERN DEF. PISTOL UPPER 9MM delivers a reliable, ready-to-fire AR-15 SD MOD 4 9MM upper receiver package that blends precision engineering with practical versatility for PCC builds and rifle-style concealed carry setups. Crafted in the USA with a steel barrel finished in Melonite, this 4.00-inch barrel features a 1:10 rate of twist for stable 9mm Luger projectiles, ensuring consistent accuracy and dependable performance across a range of loads. The compact 4.25 x 4.40 x 18.75 d