ok you started well but lost edge as you went
blockland doesn't like curves, or even anything that vaguely resembles curves. the fourth gun's chassis is too long (when creating a gun for blockland, the foregrip should almost always be longer then the chassis if present) and the stock is all weird and disgusting because you tried to go out of your way to make it 'smooth', the back of the third gun is a slope with nothing on it nor any protrusions to ease up on the slope-iness, and the second gun's barrel is too low for it to actually be a revolver.
also this is more a personal preference thing but the gun names are really pretentious. seriously, "Arteidies Magnum?" "Harkonenn Sniper?"