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Matthew, this has a 16 inch barrel with a 1:7 twist and 1/2×28 thread pitch. It also had a 12 inch handguard not 15 like in the description. According to reviews the castle nut is staked but can't find anywhere that radical firearms states it's staked. Additional information here if interested......................... Barrel Length: 16", Barrel Material: 4140 Chrome Moly Vanadium, Barrel Finish: Melonite, Barrel Profile: SOCOM, Barrel Thread Pitch: 1/2x28, Chamber: 5.56mm, Twist Rate: 1:7, Barrel Extension: M4 Feed Ramps, Gas System: Mid Length, Gas Block Type: .750 Low Profile Gas Block, Muzzle Device: A2 Flash Hider, Upper Receiver Material: Forged 7075 T6, Upper Receiver Style: M4 MIL-STD, Upper Receiver Finish: Type III Anodizing, Handguard Type: Free Float, Handguard Style: M-Lok Thin Rail, Handguard Length: 12", Lower Receiver: Forged 7075 T6, Lower Receiver Finish: Type III Anodizing, Fire Control Group: Semi-Automatic MIL-STD, Grip: MFT EPG16V2 Grip, Buffer Tube: Carbine MIL-ST

Hi Matthew and welcome to the Buds Community. The Castle Nut is staked and the barrel twist rate is a 1:7" Twist Rate & Threaded 1/2x28. Cheers and stay safe!