Down here it is very common for someone who takes his rifle,handgun or shotgun in to have it cleaned. I know one guy who does very well cleaning other folks guns. Myself I'm pretty conversant with most military surplus rifles, shotguns and commercial rifles. Self taught on the above and really like cleaning my handguns as well. remember the saying you see on some t shirts."the voices in my head told me to stay home and clean my guns". Funny thing though at the local gun shows almost no one sells cleaning supplies. More than once have been at the local range and someone will say they just got this rifle or whatever from some gunshop and first time to shoot it. You can almost be sure the dealer at a show isn't going to take the time to clean any mil surp or commercial firearm prior to it being sold.Frank