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1:9 Is the twist rate

20inch Barrel with a 1:9 Twist Rate : (Specifications and Features): - Bushmaster AR-15 Target A3 Semi Auto Rifle - 5.56 NATO chamber accepts .223 Remington ammunition - 20" Chrome lined, heavy profile barrel - A2 flash hider, 1/2x28 threads - 30 rounds - A3 upper with removable carry handle - A2 front sight assembly - A2 fixed stock - A2 pistol grip - Length: 39.5" - Weight: 8.78 lbs - Black finish .