I wish Larry Potterfield would have done this instead fellas.
First off there are some points missing here:
-Number one ensure you have a safe/empty gun
-Rack the slide fully back
-Then turn the magazine cap DOWNWARDs in a tightening motion, this will free itself up from the barrel lug overtop
-Turn the barrel 90 degrees (to the left from the shooter/holder's perspective) so the interrupted threads are free of the receiver, and pull the barrel forward off the gun, set it aside.
-You can see the freeing detent on one side of the barrel lug which is silver soldered to the bottom of the barrel.
-If you decide now to clean the tubular magazine, keep in mind the magazine spring is compressed. Did I really need to tell you that? Probably not.
-Moving to the butt stock one has to remove the butt plate (or yes the recoil pad if there is one covering it up)
-Now you have access to the long through bolt securing the wooden butt stock to the receiver
-Depending on the year of manufacture, you might need a socket (7/16s?) or just the proper size flat tip screw driver tip to loosen the action through bolt, either way a long 1/4 or 3/8s extention
is needed for the socket or a long flat tipped screwdriver.
Yeah the last three steps kind of turn most people off. The factory screws just sit in the wooden butt stock, so frequent disassembly ends up lossening their locking bite onto the bare wood!
That's why I only remove the butt stock maybe once or twice (how about once) a year for a detailed cleaning of this area.
For the most part, this is not necessary anyways, with routine care. Unless the shotgun goes for a short swim!
Now the disassembly video really starts on the next step.
Be warned that at 2:58, 4:50 and 6:30 he fiddles with the shell stop.
Remember to put a bit of blue locktite on the action through bolt upon reassembly.
For the most part, everything else is bang on. Much like myself, sometimes the proper technical term escapes his mind/tongue.
Cheers!