They remind of q2 custom-guns.
Animations look like taken directly from a q2 v-weap ?
Sauer/cube uses diffrent frames for hudguns than q2... (see "frames.txt")
1-7 is idle (fixed position)
8-25 is shoot (sometimes less, depends on attack intervall.)
You need to set up proper smoothing groups, or else they will look odd with shaders enabled.
Use powers of 2 for skins. (like on that shotgun). Everything else wastes pixels and gpu cycles.
Btw, ever heard of jpg? This pack could have been 600kb instead of 4.27 mb...