These are some weapon models I made recently, I would like to receive some opinions to improve

I'm not too knowledgeable about pixelart or guns, but I think they look pretty neat! My main issue is the outlines feel inconsistent, especially with the models in the third picture, but I don't know if making them continuous would affect their shape too much. Also, the tilted pixels on the top left gun of the third picture don't look great imo, but that's quite subjective.