BudsGunShop.com - Twist Rate

1 in 9 Twist rate Ed. ---- (Specifications and Features): - Bushmaster M4A3 Patrol Carbine semi auto rifle 90831 - 5.56mm NATO (accepts .223 Remington) - 16" M4 profile 4150 chrome-moly steel barrel - Chrome lined bore and chamber - 1:9" twist rate - Muzzle threaded 1/2 x 28 TPI - A2 birdcage flash hider - A2 pistol grip - A2 fixed front sight - Drop in quad rail handguard - Flat top upper receiver - Removable carry handle - 6 position collapsible stock - 30 rounds - Accepts standard AR-15 pattern magazines - Gas operated - Overall weight 8 lbs - Black.

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Hi Ed, It has a 1:9" Twist rate. Specs - Bushmaster M4A3 Patrol Carbine semi auto rifle 90831 - 5.56mm NATO (accepts .223 Remington) - 16" M4 profile 4150 chrome-moly steel barrel - Chrome lined bore and chamber - 1:9" twist rate - Muzzle threaded 1/2 x 28 TPI - A2 birdcage flash hider - A2 pistol grip - A2 fixed front sight - Drop in quad rail handguard - Flat top upper receiver - Removable carry handle - 6 position collapsible stock - 30 rounds - Accepts standard AR-15 pattern magazines - Gas operated - Overall weight 8 lbs - Black.

This rifle features a 16" 4150 steel chrome lined barrel with a 1:9" twist rate.