Awful
The creator has no idea what most of the parts are named. He calls pistol slides the "body", rifle barrels the "chamber", vertical foregrips the "upper", underbarrel accessories the "launcher" (even if theyre all just flashlights and laser pointers), et cetera. And thats just the stuff I remember. Deleted it after ten minutes.
Like others have already said, almost everything is out of proportion to some degree. You got two-inch long shrunken rifle stocks on machine pistols with grips the size of the trigger guards and silencers barely wider than the bullets that are supposed to pass through them.
Most of the different gun parts are completely incompatible in real life. For example, you can put a Five-seveN slide, barrel, and chamber on a M1911 frame despite the fact these two guns use entirely different caliber ammunition not even close in size and shape.
Smithy McGee about
Guns builder 2 - HD Shotgun & Assault rifle & Handgun Building, v3.2