So I have a family member who has a Vector arms full size mod.A Uzi carbine. Probably has 500 rd.s through it (bought it new). He is having occasional issues of getting a round not fully feeding and getting hung up. I stripped it down, cleaned it and did notice that the ramp seemed a tad rough (due to the parkerizing. There are no dents or gouges that I could see or feel.) Would it be any benefit to polish up the ramp a bit? If so, any recommendations on what product to use?