I wouldnt use just loose shot. It will have an impact jack hammer effect on your reciever and can lead to stress cracks. Any weight added into a buffer needs to be solidly in place so it cant move as the buffer cycles
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...