We had the enormous cicada's come out a few years ago. i wore ear muffs. would be several hundred in each tree. was them smaller red ones and it's about time for them to emerge again.
Owner of the gun shop i go to has an original full auto G36. i tried to make a deal. he wasn't goin for it. he said i could shoot it, i said well wait and i'll bring one you can shoot. i already brought him two to shoot. he can shoot behind his gun shop.
Ok, that rattle is most likely your stock. i just tested mine with it on and off. it rattles with it on and don't when it's off. if you can't move your upper and lower with your hands that's not it. take that stock off and try it.
Gun shop up the toad just got in a 320 flux. he sent me pics and ask me if i wanted first crack at it. i turned it down as i think they are ugly but the video he sent me it went off in the store. no mag or ammo. they just go off all the time. i hear all mine goin off in the safe all the time.