Every time someone shows off their latest gun it is always exactly the same, they only ever show the side view sprites, anyone can get a reference image and make some line art based on that then just fill shade it with a couple of colours. They never do the other views because that's actually difficult getting the perspective bang on and I've seen enough pillow shading to last a life time.
I'll agree with the other 3 that who ever made the 1st gun didn't make the other 3. Also judging from your
OTHER thread it looks like all the guns you've made massively deviate in style from the others you've made.