Some questions about the z-levels and the loot crates

[Riffhunter]

Thanks everyone for the answers, they've been really helpful!

Regarding the topic of surplus crates again, I know that in traitor rounds and nuclear operatives you have the ability to get traitor only items such as the revolver, shotgun or other goodies. But are things such as the hunting rifle or the laser one acquired in some specific way not involving the PDA? Are they only for nuke ops? Sorry if this question is a bit noobish, but I'm a bit lost here, thanks again!