Everytime I empty the swarmer, it takes a while for it to disappear, and when it does..NO GUNS! No arms, no nothing..

That bug has always been there, never went away... Same with the alien weapons.

Never happend to me though. I mean, it takes long to put the swarmer away but i have always my weapon after using it. I can't look into my scope after using the air stomp, does this happen to you guys too?

No my gun just completely jams, I can aim and switch weapons for at least 20 seconds.