i picked up an nt11 used (first time ive ever had one in my hands) and the bolt looks like its dented or scratched or something. its hard to see in the picture but the top looks like it has chips in it, and the sides have semi flat segments running down. it was chopping paint last i shot it so would that have been the cause? if so would the pooty polish help to any degree? thanks for the assistance in advance.