So this card is just worse than Overpower or Manual Dexterity (depending on if you're using Fist or Foot for your ranged assets).
What's the problem? Primarily it lies in the narrow use case for this card: 'Use it on a skill test from an ability printed on a Firearm or Ranged asset".
Taking Fist as the obvious example, here are four things you can't commit it to that Overpower could:
- A melee weapon attack
- Generic fight actions
- Miscellaneous skill tests requiring Fist
- Another investigator's Fist check, including even when they use a firearm (as it has to be one you control)
Surely then Crack Shot is strictly better than Overpower on a firearm attack? Well, an extra +1 to the skill test is nice and necessary especially at higher difficulties. But Overpower makes up for it by letting you draw a card if you succeed.
While I can't objectively say one is better than the other- though usually I'd prefer the card draw, even in it's one niche case Crack Shot is contentious.
To summarize, the extra skill icon is not worth the restrictions this card places.