FN FiveseveN Pistol threaded barrel

I bought this barrel and have not used it. They sell for $380. I am selling for $350 OBO. It is a B&T barrel (I think Jarvis makes their barrels). It also comes with the adapter to 1/2 X 28 for standard 22LR suppressors. It is in perfect (new) condition.

Thread Pitch: 10x1mm Right Hand
Thread Protector: Included
Adapter: Included at no extra charge from 10x1mm RH TO 1/2X28RH
Recoil Spring: Factory standard weight
Twist: 1/9
Rifling: Conventional, button rifled
Material: 4140 Gun Barrel Certified Steel
Hardness: 40-44 HRC
Crown: Recessed 60 degree crown