I need a little help... I bought a Charles Daly 28 ga Field Hunter automatic for my son to shoot. It was shipped to me with the barrel off, and when I put back together it will not allow the bolt to close completely. There are 2 extra what I call shims on the shell tube that I'm not sure how they go. I've tried one at a time and both together which none work properly. I've looked for a break down but can't find anything on a 28 ga. I've figured out there's only 1 shim on a 12ga. Any suggestions would be great or if you might have one a picture of how yours goes together would be awesome! Thanks for any help!

If I go with 1 shim it'll shoot and load another but will not shoot the follow up...

PB