By and large an iffy asset. It has a number of problems that make it inferior to some routinely good cards, even some straight up mediocre cards are better at doing the things this one is supposed to.
This card is...
1) Unwieldy! This is an asset that specifically targets a playercard type. Without a Firearm this thing is blank. It doesnt have Icons that lessen the impact of having a useless copy of this in your hand. When the time comes to actually use this thing it's an action and 2 resources to play, on top of the XP. Guns are already cost and generally XP intensive so these are steep costs indeed.
2) Ineffective! In general, swapping for or the enemy -Fight- for -Evade- is a net benefit of +1 or +2. You're getting this benefit because of an innate skill or difficulty difference, so you're paying the costs agove not to get a bonus on top of your good numbers, it's to replace bad numbers with good numbers. I.E, a character that doesnt have this thing in play either has a small enough difference between and that a similar benefit would be accessible via Hard Knocks, Delilah O'Rourke or Well Connected, or the difference is so great that without Sharpshooter in play the Firearm's you aim to use it with are outright unusable (for example if you play Trish or Sefina).
3) Useless! The only benefit of playing this thing is to get a statistical upgrade on attacks, something that a heap of other cards can do already, and do it better at similar or lower XP costs (Delilah O'Rourke, Hard Knocks, Well Connected). Worse still, this thing Exhausts! You only get to buff one attack per round!
I do NOT like this card. For this mechanic to be useful it ought to be a Permament card. Frankly I think I'dd be happy to pay 4 or 5 XP for this card exactly as written. Heck make it a 2xp exceptional permament!
Wishlisting aside, this thing is garbage, if youre looking to spend 3 XP on Sharpshooter, just save the 1 XP and get Hard Knocks.