Hi Peter, the barrel length is 10 1/2 inches without the muzzle brake. The muzzle device only counts as part of the barrel if it is pinned and welded, which this is not.
Stay safe and have a great day!

Hi Peter and welcome. Barrel Length is 10.5 inches to the end of the barrel threads, The flash hider is 1.3 inches. Cheers, stay safe and enjoy!

Barrel Length is 10.5" b4 added Flash hider.
Barrel Material: 4140 Chrome Moly Vanadium
Barrel Finish: Melonite
Barrel Profile: HBAR
Barrel Thread Pitch: 5/8x24
Chamber: 300BLK
Twist Rate: 1:8
Barrel Extension: M4 Feed Ramps
Gas System: Pistol 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
Forward Assist: MIL-STD
Dust Cover: MIL-STD
Handguard Type: Free Float
Handguard Style: M-Lok Thin Rail
Handguard Length: 10"
Charging Handle: MIL-STD
Lower Receiver: Forged 7075 T6
Lower Receiver Finish: Type III Anodizing
Safety: MIL-STD
Fire Control Group: MIL-STD
Buffer Tube: Pistol Tube
Magazine: 5.56 30 Round