Update: Back at the range yesterday morning. Another fifty rounds of #LEB127DPRS Federal LE Tactical TruBall Deep Penetrator Rifled Slugs and still not another fail to eject. Total rounds since the last fail-to-eject issue stands at 134.
I did have an issue where I fired a round and the next round in the magazine failed to load. I pulled the trigger to a “click” on an empty chamber but could then feel / hear the next shell load itself onto the carrier. I looked and saw there was only the one shell on the carrier, pulled the charging handle which loaded the shell into the chamber, and it fired fine. No problem with about a dozen shells afterward but I have no idea what that was about.
Final update: 50 more rounds of the LE slugs this morning and zero issues. Haven’t had a chance to try the PB127DRRS in a known reliable shotgun yet but looking more and more like the ammo might have been the issue. Or the shotgun just needed broken in. At 184 rounds since the fail-to-eject malfunctions I’m feeling much better about the 1301.
I got a 1301 4 months ago, 10/22 and have experienced the failure to eject issue also. I had shot slugs for the most part, as I began using it at an indoor range which only allows slugs in shotguns. I got the snags on one type of ammo, Fiocchi 1300 fps slugs. I have found that any rounds 1350 and above cycle smoothly. I've deduced that the gas powered system requires a certain amount of pressure to make the cycle happen, and that slower slugs fail. I'm still working through the issue.