It's lame. Ofcourse I think the spas pushes a little too much too but atleast the spas pushes the user back to. Autos don't have a force pushing back on the user to limit the user's momentum. My thoughts

Well, as I noticed, the push-back of autos depends on the projectile speed and some other, uneditable factor which depends on the gun itself. So I could edit it to be lower, but then autos would turn into garden sprinklers.