500 cigarette adapter. Just like Lt. Commander Bortus requested. 

I am by no means responsible for anything you do with this model.
Talking of which, good luck printing it; I have yet to split this up or tried to make it easily printable by any means (and it's a chonky boye).
7.95mm in hopes of friction fitting 500 8mm cigarettes. If not, you'll still end up with a hilarious display piece. 
Bottom picatinny rail available so you can hold the damn thing up with a foregrip.