RE: Auto Shotgun Cleaning
Browning A-5's are pretty dependable. You can't really do much as far as extensive cleaning because of the way are put together, but then they really don't need it unless you shoot alot. My shop said to bring it in every 5 years or so for normal use and they can take it apart and clean the action, cost about 70 bucks.
Other wise you just wipe it down, oil a few spots and clean the barrel.
You would have to get one used though.
I agree with the AR or M-16 not being that hard to clean, I could completely dissasemble one and clean it in probably 20 minutes. And I mean taking the bolt apart and everything. They are a pretty simple design and fairly easy to field strip.
Paul