Matador Arms MAT-9K AR-9 9mm 5in Roller Delayed Upper Reciever 4150 Lightweight Nitrided Barrel 1-10 Twist 1/2x28 Threads Anodized Gray

Matador Arms MAT-9K AR-9 9mm 5in Roller Delayed Upper Reciever 4150 Lightweight Nitrided Barrel 1-10 Twist 1/2x28 Threads Anodized Gray. The 9mm upper is machined for maximum weight reduction slim profile and compatibility with bolt catches and lower receivers. The upper is also built with a tapered multi-material 4-piece trunnion system to maintain mechanical accuracy and durability. The MAT-9 9mm AR upper is compatible with AR-9 Lower receivers in any double-stack magazine configuration: Glock