I don't like asking for this type of advice but I have never had to disassemble a pump shotgun before, and a very close family member asked for help with their shotgun. Weapon is a Remington 870 Wingmaster, 12ga 2 3/4" shell. He purchased it from a local police auction and the first time he took it to shoot it, it "locked up". There is a shell in the magazine tube assy. , and its stuck. The slide is locked in the forward position. He was not able to chamber the round, he was going to put one shell in, chamber and fire it to see how it did.
Is this something that should go straight to the gunsmith? I am an otherwise accomplished DIYer ,I just am not sure where to start on this?
(Sorry for a noob like question).
(In the first picture, I am pushing down the "tongue" on the bottom of the receiver, thats as far as it will go. You can't see my finger pushing it down, but you can see how far it does down and the shell. Is it supposed to go further than that?)