What can be said about this gadget that hasn't been said already?. Middle of the road difficulty makes it an easy splash in almost any gadget deck, though you'll most likely find the most bang for your buck in a high value gadget deck.
A rather simple mechanic that we have now been exposed to twice, Gina Tailfeathers being the grifter that let's you discard a card from your play hand to draw 2 cards when the game first starts.
The seemingly most apparent flaw would seem to be the requirement of at least one draw dude in the shootout in order for the revolver to go off. However, in a deck with a really tight draw base, say 16x Js and 16x Ks, auto revolver can easily filter out those unwanted extra values, while also increasing your hand size even further as a sort of post discard stud.
Simple, cheap, and a surprisingly useful mechanic, I recommend it to anyone interested in trying gadgets.