I was recently gifted one of these from my dad, So I am kind of embarrassed to ask but it's not something I have seen before. I downloaded a video on how to clean it properly and have done so, How do you load this thing there is what appears to be a cartridge tube that inserts to the butt of the stock , but there is also on the side of the stalk where it looks like shells could have been fed?!?! or possibly ejected cartridge's .. any info appreciated, I looked for a pdf for a manual but was not able to find one, Thanks All:huh: