870 Takedown and Function Test

[Mug]

I had trouble finding 870 function test info here and anywhere online, so I'm going to post it here for future reference (function test starts at 4:15)

http://www.youtube.com/watch?v=hkPJHzw4PXg&feature=PlayList&p=7A4E5F77E49073D6&index=0&playnext=1

There are many new SG owners so I will post a series of posts to help them out.