My 3-gun shotgun is the M3K, and for the most part I have had very little issue with the gun over the past 2.5 years. At yesterday's match the shotgun started jamming rounds into the side of the barrel when feeding. I had some Federal, RIO, and Winchester in my bag and could duplicate this with each shell. I did not have any AAs with me at the time, so I am not sure if those shells would make a difference. It was suggested that I knock down the sharp edge of the barrel and round it off a bit to solve this problem. Question is... why did this start happening out of of the blue? and what can I do to fix it?
Thank you!