SSK Firearms 6.5 Grendel SSK-50 / Contender 14 inch Barrel with TSOB Scope Base and Thread Protector 1-8 Twist 5/8x24 TPI C8005. 5 Grendel SSK-50 Contender Barrel with TSOB Scope Base and Thread Protector. Established by using some of the most strong...