So after all that I was like hmm, I think i'll share that with my group and see what they say..
Sounds like a load of BS, which is not uncommon from gunshop employees.
If you want to buy the gun I think you should wait until he is working and get him to help you buy the gun just for the hell of it. Tell him you looked into all his accusations and found them to be false, then sit back and watch the fireworks.