Actually this is a forum post asking what weapons you are not proficient in, or weapons you cannot get used to (weight distribution, kick, etc.) not weapons you can't get easily but just ones you can't use (well or at all)
and if possible a reason you can't use it.
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For me it's pretty much any machine pistol or small sub machine gun such as the mac-10 or tec-9. My hands aren't good with small things firing at a fast rate. Im used to shooting shotguns, semi-automatic rifles, and lever-action rifles. I am good with full auto trust me, but when the thing is too small for both my hands, yet strangely large for one hand, I'm a miserable wreck.

(yes yes it's weird I know, don't patronize me.)