I hadn't thought about a used gun but that is a good idea. Recently I bought a Remington 700 ADL in .30/06 for very little money and I took it to a Remington service center in Louisville to have it checked out. The 'smith said it was in need of a good cleaning but he didn't think it had had 50 rounds run through it and he was using a borescope, so he was able to look at it well. When I called Remington to give them the serial number, they said the date of production was 1977!!! A few things to look for, or at least this is what I look for, is even wear on the bolt lugs from side to side, smooth feeding ramp (no dings in it to mess up your bullet when chambering a round), look at the rail the bolt slides on to see if the bluing is worn off and look at the crown on the muzzle. If everything is sharp and the crown is smooth without dents, etc. If it is, a good 'smith can recrown the muzzle for nearly nothing. Also, when you have the bolt out, look at the bolt face to see if there is any pitting. If there is, whoever had it before was probably loading ammo. that was excessive in pressure. You may know other things as well that I don't but these are just what I initially look at when I am looking at a used gun. BloomGrad had a really good idea. I am lucky enough to have found some real bargains on second hand guns and some good shooters in the mix, as well. Good luck.