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1:7 twist Specifications and Features: Colt Expanse M4 CE2000 AR-15 Semi Automatic Rifle 5.56 NATO chamber accepts .223 Remington 16.1" M4 Profile Barrel 1:7" RH twist, 6 lands and grooves Gas operated, multi-lug rotary locking bolt Carbine Length Gas System Standard A2 Fixed Front Sight Base Forged flat top upper receiver Forward Assist and Dust Cover Included Collapsible Stock Black Hardcoat Anodized Finish Overall Length: 32" Collapsed to 35.5" Extended Weight: 6.44 lbs

James the Colt CE2000 has 4150 CMV barrel with Manganese Phosphate finish, 1:7 right hand twist, 6 grooves and non chrome lined.

1:7 twist Specifications and Features: Colt Expanse M4 CE2000 AR-15 Semi Automatic Rifle 5.56 NATO chamber accepts .223 Remington 16.1" M4 Profile Barrel 1:7" RH twist, 6 lands and grooves Gas operated, multi-lug rotary locking bolt Carbine Length Gas System Standard A2 Fixed Front Sight Base Forged flat top upper receiver Forward Assist and Dust Cover Included Collapsible Stock Black Hardcoat Anodized Finish Overall Length: 32" Collapsed to 35.5" Extended Weight: 6.44 lbs

Hi James, This comes with a 1:7 twist. Specifications and Features: Colt Expanse M4 CE2000 AR-15 Semi Automatic Rifle 5.56 NATO chamber accepts .223 Remington 16.1" M4 Profile Barrel 1:7" RH twist, 6 lands and grooves Gas operated, multi-lug rotary locking bolt Carbine Length Gas System Standard A2 Fixed Front Sight Base Forged flat top upper receiver Forward Assist and Dust Cover Included Collapsible Stock Black Hardcoat Anodized Finish Overall Length: 32" Collapsed to 35.5" Extended Weight: 6.44 lbs

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1:7 twist Specifications and Features: Colt Expanse M4 CE2000 AR-15 Semi Automatic Rifle 5.56 NATO chamber accepts .223 Remington 16.1" M4 Profile Barrel 1:7" RH twist, 6 lands and grooves Gas operated, multi-lug rotary locking bolt Carbine Length Gas System Standard A2 Fixed Front Sight Base Forged flat top upper receiver Forward Assist and Dust Cover Included Collapsible Stock Black Hardcoat Anodized Finish Overall Length: 32" Collapsed to 35.5" Extended Weight: 6.44 lbs