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David, this rifle has a 16" 4140 Chrome-Moly Free Float Barrel with 1:8 Twist Rate.

David, this rifle has a 16" 4140 Chrome-Moly Free Float Barrel with 1:8 Twist Rate. ----- ((Complete Specifications and Features)): - Diamondback Firearms DB15EFDE - AR15 Semi Automatic Rifle - 5.56 NATO (accepts .223 Remington) - Mid-Length Gas Impingement System - 16" 4140 Chrome-Moly Free Float Barrel - 1:8 Twist - 30 Rounds - A2 Flash Hider - 15" Diamondback Aluminum Key Mod Handguard - Shot-Peened, MPI Mil Spec 8620 Bolt Carrier - A3 Flattop Forged 7075 T6 Aluminum, - T-Marked Upper - Forged 7075 T6 Aluminum Lower - Collapsible Stock - Anodized Flat Dark Earth Finish - Weight 6.65 Pounds - Length 32.5"-36.25" - No Sights - Optic Ready - MADE IN THE USA!

1:8 see *********Action Semi-Automatic Caliber 223 Remington/5.56 NATO Barrel Length 16" Capacity 30+1 Trigger Standard Safety Manual OAL 32.5"-36.25" Weight 6.65 lbs Stock Description Magpul CTR Flat Dark Earth Muzzle A2 Flash Hider Receiver Material Aluminum Sights None, Optic Ready Barrel Description 4140 Chrome Moly M4 Contour ********Twist 1:8" Hand Right Stock Finish Group Synthetic Metal Finish Group Brown/Tan License Requirement FFL Manufacturer Diamondback Mfg. Part Number DB15EFDE UPC 815875017929 Caliber/Gauge .223 / 5.56 Action Semi Automatic Barrel Length 16