The armor with that skull ?helmet? and lightbulbs doesn't exactly please the eye. Everything else looks good though.
What's with the crank behind the clip?
I'm certain it always had one in FO3, the face mask however I like...
Maybe something to do with reading faces in NV?, protection for the casino to make sure their dealers are secret? or just simply a new outfit that boosts stats "luck"?
So theres another card minigame although based on blackjack which is in allready, (maybe a quest related game?), and many collectables hey!
Edit: damn I misunderstood. you just meant why is it there.
In which case to load a solid slug into the breach, for the micro cell to trigger a magnetic charge to expel it when you fire.. Was my personal guess.