Howdy, Im hopeing someone can help me. I have a never before fired mossberg 500C 20 guage 'youth model'. I purchased it for my sons use several years ago, and he took it with another family to camp and shoot but was unable to get it loaded. I have since just not been able to deal with it, I brought it out this evening finally, to look it over and it appears to have some sort of insert in the first 2-3 inches of the barrel blocking the diameter of the shell, is this supposed to be removed after purchase? If so how do I remove it?