I was shooting 2 3/4" 00 buck by Federal, Remmington. I had a few Stovepipes. It is not broken in, and it is on gas setting 2. I was using a 5 round, 10 round and 12 round magazine.
When I put in Winchester PDX1, it cycled all except the last one in a 10 round magazine.
Solutions?
I have an eotech 552 that is positioned just over where the ejection port is. Is it possible that the width of the Holosight is keeping a round from ejecting?
Here is a video of how my S12 is set up.