Stern Defense 9mm Upper 16.1in Melonite Steel M-LOK AR-15 Mod4 Complete

The Stern Defense AR-15 SD MOD 4 9MM Upper Receiver M-LOK Complete combines rugged, American-made craftsmanship with practical versatility for shooters seeking a reliable 9mm upper with modern features, including a steel Melonite-coated 16.1-inch barrel, a modest 1:10 twist, and a precise 3.90 x 3.90 x 28.20 profile that integrates seamlessly with AR-15 platforms. This upper delivers consistent performance for magazines and conversions in 9mm Luger, delivering dependable cycling and compatibilit