This weekend I was at the range and the funniest thing happen. My mini-14 was shooting two round burst? I shot about two boxes of ammo and I was so confused. I was thinking it was the buffer that I install a week a go. I purchase the buffer from blue press. It didn't fit the mini at first but I made the hole that the spring guide goes in a little bit bigger oval instead of round. It’s grey and rubbery. After I remove it. I was shooting normal. I believe that the action of the rifle was shorten a little by the buffer and also it rubbery material made it auto.