The manual won't answer your questions - it tells you not to take the internal mechanism of the gun apart ( which is nonsense ) if you have any experience with guns. I think they should be fully taken down almost every time you shoot them ( and so should every pump gun, in my opinion ).
There are a lot of books, Gun Digest prints some, etc that tell how to fully take a BPS down.
Take the barrel off / then basically you have to knock the pin out of the side of the receiver, remove the trigger group ( I use a 10 penny nail, with the tip of it ground to fit the pin ) or a set of gunsmith punches if you have them are fine too. Then the bolt, etc will all come out / but pay careful attention to how things fit together as they come out / so you can get it back together. Don't force things back together / be patient and you should be fine. I think its pretty obvious once you get them apart / but holding the extractor bars just right / getting the trigger group back in just right can be a little tricky the first couple of times you take it apart. Just be patient.
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