Where are the old dogs and pistol smiths?
About 70% of my guns are used or 2nd hand and many are models that are listed on this thread.Almost all had minor problems for the original owner.
Most frequent problems:
1)stovepipes-dry magazines or a handshake with the former owner will usually explain the problem.1911's are often as sensitive to magazines as many guns are to ammo type.If you don't agree to apply a bank vault grip to a semi-auto (especially polymer guns),find a nice revolver and learn to love it.
2)Hybrids-With formats that are steel or stainless to alloy,polymer,stainless mixed,GUN OIL is NOT your best friend!! You might run synthetic lube in your $20-70,000 car or truck with synth.lubes all through the system,but not even blink at pouring gun oil all over your handgun.Most of the miracle lubes out there are silicone/teflon based,and have been reliable since they helped un-jam the early AR-16's,and the new string molecule theories have only made them better.
3)legends vs. myth-A lot of the reputation of SW,Colt and others were made in a time when the guns were literally handemade.When the bulk of the firearms industry relies on CNC machining to mass produce guns and probably does very little in the way handfit,massive numbers of gun owners STILL fail to believe that you need to run a few hundred rounds through a gun before you judge it or trust your life to it.Most of the manufacturers are in business to make money and I wager most work pretty hard to correct first release,past problems and what WAS a few years ago may not be what IS now.You did'nt buy a custom gun,so why would it transform by magic in your gun safe?(examples-original XD platfom was a top heavy accuracy dog and many say that hase'nt changed,Ruger SR9s were a first release nightmare,now many swear by them etc..etc..)
4) Some guns need TLC to be happy,so do some gun owners.Most blowback autos don't like hollowpoints until the lower third of the chamber edge is smoothed out;trigger pulls on many guns are very often no more than cleaning up after the manufacturer,the RIGHT lube,springs and a good run in.
(my KT-P11 was a dog before the fluff & buff and lube,ammo selection,now I bet my life on it every time I carry it;I'm NEVER worried unless operator error causes a failure.)
5)A lemon is a lemon;get over it and move on,,trust but verify,try before you buy;do'nt buy the hype;buyer beware;if you can't shoot it don't shoot it;don't let macho intrude on common sense;never be afraid to ask if you don't know.
6)What I don't know would fill volumes,but I can learn,as long as you hit me with the right stick to get my attention.