I recently purchased a Sistema that was advertised by the gun shop in "excellent" condition. When checking it out at the shop it looked and felt good but I really couldn't get a good look in the barrel, there was a lot of dirt/grease in there plus the lighting was bad. Took it home,(after ten days of course-bunch of crap) stripped it, cleaned the barrel and upon closer inspection, the entire barrel (inside) is extremely pitted and the rifling looks very worn. It is a JLD Enterprises pistol and according to their Grade descriptions this seems like a Grade 1, it has all matching serial numbers and no scratches externally. What can I do at this point other than get a new barrel?