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Gary, barrel twist rate is 1-in-8 inches Sir.

1:8 right hand twist see ********UPC: 736676085293 Description: RUG AR-556 FFH 5.56 16B 30RD Brand: Ruger Model: AR-556 Free Float Handguard Type: Rifle: Semi-Auto Caliber: 5.56 NATO|223 Finish: Black Action: Semi-Automatic Stock: Black Synthetic, Collapsible Sight: No Sights Barrel Length: 16.10 *********1-8RH TWIST Overall Length: 32.25 - 35.50 Weight: 6.70 lbs Capacity: 30+1 # of Mags: 1 (Magpul) Receiver: Black Finish, 7075-T6 Aluminum Upper & Lower Features: Improved Trigger-Reach Grip, Forward Assist; 11 Free Float Handguard W/ M-Lok Attachment Slots