Steampunk Applejack is a mechanic. I just can't see her doing anything else. And that's why I gave her the bag instead of a gun (besides, could she even use it with hooves?).
Steampunk-western mix looks easy to draw... I used to think like that. I didn't realize how hard is to mix those without making the whole thing exaggerated in one or another way.
AJ is incredibly difficult to steampunk, because you can't give her a giant top hat covered in cogs, fancy victorian dress, corset or copper jewelery. She's just too practical for all this stuff.
Other Steampunk Ponies:
The Lady - Rarity [link]
The Inventor - Twilight Sparkle [link]
The Timid - Fluttershy [link]
The Pilot - Rainbow Dash [link]
The Random - Pinkie Pie [link]
The Princesses - Celestia and Nightmare Moon [link]
The Dentist - Colgate [link]
The Flyers - Spitfire and Soarin' [link]
The Smuggler - Carrot Top [link]
The Messenger - Derpy Hooves [link]