I bought a 4 mm carbon fiber rod 30” long on Amazon. Mostly for new shooters who double feed.Aw that’s a pain indeed. When I was new to my M3 I had the same. Although double loading does almost never happen to me anymore.
Don’t know if you damaged the barrel. However, the good news is: it’s just liner. If you really damaged it it’s quite cheap to replace. So I wouldn’t think about it too much.
If you want to push out pellets, the best is to take a proper cleaning rod. I have one in carbon, that helps reduce the risk to damage the barrel.
Upvote 0