Product Info for SSK Firearms 6mm ARC Encore Threaded Rifle Barrel with TSOB Scope Base and Thread Protector Meant to be a superb product for almost any person, we're positive you will love the SSK Firearms 6mm ARC Encore Threaded Rifle Barrel with TSOB Scope Base and Thread Protector.image Developed using some of the very most sturdy and long lasting resources around, these Rifle Barrels from SSK Firearms will present you with a product that will give you numerous years of reliability.