A question

[Xoria]

I wanted to ask if it was allowed to, in RP, hijack a weapons shipment from a weapons dealer.

Yes, it is allowed.

It would be RP-ed heavily, but the thing is, I am asking if it is allowed if the weapons dealer does not know about it.

Yes, it is allowed.

I am just asking if it is prohibited by some rule

No, it isn't.
Treat it like any other act of piracy and you should have no problems. Demands to drop all cargo are not unreasonable from a rules standpoint, no matter what the cargo is.

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