Yep - It sound like he's got a screw loose,
[The bolt's serial is different, though and begins as 500**. I'm not sure if that has any significance.]
Most surrendered arms were partially disassembled upon surrender - aka the bolts removed - with the now rendered harmless rifles in one pile and the bolts in another, separate pile.
When/if they were re-assembled, as in when a business bought the two piles of mil-surp parts - the guns then simply had a ramdom bolt installed, since there was no way to do a match.
It may be in spec, but if I was going to shoot it, I would have the headspace checked first.