I had a couple the other day shooting mine. I had shot it about 20 times. I pull the trigger assembly out and back the breech plug out and back in after every 5th shot. I feel my problems was from the crud around the primer seating area. After I had a misfire I looked it over real good and noticed after I had dropped the primer in and closed the breech it didn't seat as well as it should have and I think it was not allowing the firing pin to contact the primer fully. I pulled the trigger assembly out and gave it a blast of Remington shotgun cleaner. That stuff is great, it dries in seconds. Then I gave the assembly a shot of rem oil in a spray can, shook it off, and started shooting again. No problems after that. Those Remington Kleen Bore primers I think have a lot of what I heard guys talk about "blow back"