about how many rounds before end shake starts showing up and how to fix it? i have a service six, i bought it from a guy who's uncle used it as a duty weapon. he said that he would estimate about 5000 rds have been through it. it is tight on lockup with no problems, just thought i would ask in case it happen's to me. I am keeping this gun and will be handing it down to my son. i'm not putting much through it, i shoot every few weeks mabe 20rds or so. thanks