Thompson Centre Impact 50 caliber

I bought this gun new, and have used it regularly at our local range for several years, never hunted with it. Regardless of amount of shots fired, I completely dismantle the gun after every use for cleaning .This gun shows no signs of wear in either outward appearance or rifling, no pitting or rust anywhere. I added a rail and red dot, making this gun  very accurate. The only fault which I will mention is the thread on the ramrod is stripped, although I still use the ramrod with jag to push patches through the barrel. You would be hard pressed to tell this gun from brand new.