Yes, he always shows the gun. But he only shoves it in the MC's face if he punches him. I found something interesting... In Ep.8, the guy who gave the MC kickboxing tips says something similar to Vinny when the MC says he has no intention of fighting Caleb.
MC: "I'm not looking to fight him."
New Guy: "Sometimes that option's a luxury."
In Ep.9, when the MC tells Vinny not to start a fight because he has no intentions of fighting Vinny:
MC "Trust me, you don't want to fight me, so don't start one."
Vinny "Don't start a fight? Haha! Life doesn't work that way."
Great find and conclusion and yea that's exactly what I believe will eventually unfold.
The standing Vinnie theory at least among some is :
Vinnie uses the DIK laptop to post the Cathy pic, in an attempt to force Rusty to resign for 2 reasons. One because he knows that Rusty is the entire DIK treasury and two because it promotes Tommy to president.
Vinnie then has the DIK mansion trashed, leaving the DIK's without money and a trashed home.
Vinne takes a bundle of cash, meets with Tommy and says "Hey I heard you guys ran into a problem, how about I help you guys out and in return you let me use the mansion as an HQ to deal out of" , since the Mansion still has Burgmeister protection.
Vinnie has Quinn jumped and her money stolen, so that she has to raise her prices and ruin her customer base.
So in short, Vinnie wants B&R for himself.
But again, it's just a theory.