Angstadt Arms AR Platform 9MM 1/2X28 Threaded Barrel. Pairs perfectly with Angstadt Arms' 5.5 ultra light handguard. Made from 4150 chrome-moly steel and finished with Melonite. Chambered in 9mm NATO. Lightweight profile. 6 long. 1/2 28 thread. 1-10 twist rate. 9mm barrel extension. Specifications for Angstadt Arms AR Platform 9MM 1/2X28 Threaded Barrel: Manufacturer: Angstadt Arms Color: Black Finish: Black Caliber: 9mm Luger Barrel Length: 6 in Threads per Inch: 1/2x28 Gun Make: AR Platform Additional Features: Barrel Handle Color: Black Features of Angstadt Arms AR-15 Threaded Barrel 9mm Luger 6 1/2x28 Black: Lightweight profile 6 long 1/2 28 thread 1-10 twist rate 9mm barrel extension Chambered in 9mm NATO Package Contents: Angstadt Arms AR Platform 9MM 1/2X28 Threaded Barrel