Gas block journal

[45C]

Hey
Could you tell me what GB journal for this barrel?
Looking for something adjustable.
Thanks

Faxon Firearms 15A58R20NGQ Duty Series 5.56x45mm NATO 20" Target Crown Steel QPQ Black Nitride 4150 Steel Barrel Fits AR15/M16​

 

[terBC]

Based on the sku

Faxon SKU: 15A58R20NGQ | UPC: 816341020214

Directly from Faxon’s website

Barrel Material: 4150
Barrel Type: Button Rifled
Barrel Caliber: 5.56 NATO
Barrel Twist: 1:8
Barrel Length: 20"
Barrel Profile: Gunner
Barrel Gas System: Rifle Length
Inside Finish: Nitride
Outside Finish: Nitride
Muzzle Thread: 1/2-28
Gas Block Diameter: .625"
Gas Block Journal Length: 1.9"
Barrel Extension: M4
Weight: 1.67 lbs
Magnetic Particle Inspected
11-degree Target Crown