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1:9 twist see **** Bushmaster #: 91823 UPC #: 604206918239 Cartridge 5.56x45mm NATO Material Aluminum Barrel Length 16 Inches **********Twist 1:9 Inches Threads 1/2"-28 Barrel Contour Lightweight Sights Yes Barrel Finish Black Parkerized Chrome Lined Yes Gas Block Diameter 0.75 Inches Gas System Length Carbine M4 Feed Ramps Yes Upper Receiver Type A3 Flat-Top Barrel Material 4140 Chrome Moly Steel Handguard A2 Carbine Bolt Carrier Assembly Included Yes Muzzle Device A2 Flash Hider Mil-Spec or Commercial Commercial

Hi James, This has a Twist rate of 1:9 Inches.

James, This very light/thin pencil barrel has 1:9 inch rifle twist in a 4140 chrome lined chrome moly parkerized {manganese phosphated} steel. Carbine length gas system. M4 feed ramp. 0.75 diameter gas block. Should be a tack driver with 55 gr rounds. Will go on any AR15 lower.

James, rate of twist is 1 in 9" on this 16" M4 profile barrel with Chrome Lined Chamber and Bore.