How new is this firearm and how many rounds do you have through it?

If this is a relatively new firearm then my guess is to shoot it more to break it in. On a new firearm, I wont even think about anything until I have at least 200 rounds through it, and really not concerned until I have over 500 rounds through a new firearm. I will agree that leaving EXTRA lube in a barrel is not a great idea when shooting, I definitely disagree with folks when they say dont lube your barrel at all. I clean and lube every barrel on every firearm, if I'm concerned about the oil in the barrel I might take a patch and run it through when I get to the range before shooting, but keeping your firearms lubed during storage is only a great idea, and not at all dangerous so dont let folks scare you about lubing your barrels.

If this happens again and you are at the range, use the pogo stick method and it will come right out. Grab the charging handle with your thumb and forefinger and smack the butt stock on the ground or bench while pulling back on the charging handle.

If you ever want to see it or you have other questions hit me up and I would be happy to explain it better or help you out.