Perfect size, nicely done, the shotty and the revolver are my favorites.

No sprite is to small for more detail. There should be no problem with these.

Looks fine, but i guess ven its too small you could add a bit mroe shading in a couple of weapons and they would look better.

Nice work :]

 i think image too small to add more detail :-)

There's lots of empty areas where you could add detail, unless you're aiming for the simple look.

You should get rid of the white dots..