I'll rephrase; if was like that when you bought it, I'd be pissed. Hopefully he inspected the gun before he bought it. If he didn't that's on him. If it happened by his hand suck it up, it's just a beauty mark.There are a lot of hands that touch the pistol before you get it. I'm just sayin'.
Nevvermind,You're right to be concerned. Your gun has serious problems and may not be safe to operate. I suggest you sell it to me for 'parts only'. I'll give you $50 for it.