Welcome to the forum!
I bet you get a lot of replies to this one.
I will try to help you some.
1-look down the bore for any buldges
2- check the cylinder for end shake by trying to move the cylinder back and forth, front to rear
3- check the cylinder for sideplay by trying to rotate the cylinder in place while the cylinder is closed, and the locking bolt is up in its notch (under the cylinder in the cylinder window) a small amount is normal for a Smith
4- cock the hammer and then using your thumb, see if you can push the hammer forward without touching the trigger (pushoff)
5- look at the top edge of the sideplate (right side piece that can be removed) right beside the hammer. Is it wrinkled up? It shouldn't be.
6- look at the sideplate screws. Are they boogered up? They shouldn't be
7- look at the sights. Are they lined up? They should be, and they shouldn't have any dents, dings or other malady's.
8- look at the stocks . Are there dents, dings, or any other indications of the gun possibly being dropped?
9- is the gun stock, or has someone modified it, like with a trigger job. Smith's have nice triggers, but they shouldn't be too light. Especially in single action, which can be an indicator of a trigger job
I'm sure others will have more, but that should get you going.
