Barrel Length: 7.5" System: Blow Back Chamber: 9MM Thread Pitch: 1/2"x36 Twist Rate: 1:10 Material: 4150 Chrome Moly Vanadium Finish: Black Nitride QPQ Made in the USA7.5" 9MM BARREL, 1:10 TWIST/NITRIDE USA MADESKU: BAR9MM-7$94.95PriceQuantityAdd to Cart