In 1977 JD Jones of SSK Industries started making replacement barrels for Contender and later Encore receivers for cartridges not supported by Thompson Center. His passion drove him to push the limits on pressure and accuracy creating barrels never before possible. They were bigger and they were more precise. JD used only the highest quality barrel blanks and built each barrel manually with precision techniques. SSK barrels established their place as being the "gold standard" in the market.SSK Firearms has taken that same commitment to quality and modernized it by using state of the art manufacturing techniques. With the exception of chambering, all barrel machining operations are done on precision CNC machines capable of holding linear dimensional accuracy to three ten-thousandths of an inch and rotational positioning to one-thousandths of a degree. FeaturesTSOB scope baseGlass bead finishMatch grade accuracy