SSK Firearms 6mm ARC SSK50 / Contender Barrel – 20. SSK Firearms 6mm ARC Contender Barrel – 20 with TSOB Scope Base & Thread Protector. SKU: C8004 UPC: 810107920046. Enhance your Thompson Center Arms Contender, G2, or SSK-50 platform with the SSK Firearms 6mm ARC 20-inch barrel, engineered for precision, efficiency, and long-range capability. Designed to maximize the ballistic advantages of the 6mm ARC cartridge, this barrel delivers excellent accuracy, manageable recoil, and reliable performance across a wide range of shooting applications. The 20-inch length provides optimal velocity while maintaining a well-balanced profile suited for both field and range use. A factory-installed TSOB (T’SOBT) scope base ensures a rigid, repeatable mounting surface for optics, while the included thread protector safeguards the muzzle threads when a device is not installed. Manufactured to SSK Firearms’ exacting standards, this barrel is purpose-built for single-shot platforms and offers a seamless fit and dependable operation on Contender, G2, and SSK-50 frames. Barrel Length: 20 inches. Compatibility: Thompson Center Arms Contender, G2, and SSK-50. Includes TSOB scope base. Manufactured by SSK Firearms. Contender, G2 Contender, SSK-50. 5/8-24, Muzzle Thread with Protector. NOTE ANTLERS NOT INCLUDED. NOTE ANTLERS NOT INCLUDED – Only the barrel is for sale.