Air Venturi Avenger - Jamming Issue

I had the same thing happen to me. At this point I blame myself, because it's easy to get distracted and load two pellets or neglect to push the cocking lever all the way forward. However, I did switch magazines just to be on the safe side. These days I generally just use the single shot tray anyway.

In that particular emergency I used a bamboo cooking skewer to force the pellets out. The ones I have will just fit in a .22 barrel. If the local Walmart doesn't have them, Amazon does.
 
I had a similar issue with my brand new avenger. Mag jammed and I couldn't unplug the pellet with the mag in. I ended up forcing a second pellet and firing the two pellets. I have never had another jamming issue since and can shoot pelletshole in hole. I am having serious accuracy issues with slugs since and worry that I did some kind of damage to the barrel (I did also try a couple barrel cleaning rods). Is anyone else have problems with slug accuracy in their Avenger?