never mind

Just pull on the end. It 'clicks' into a catch on the forend, and it can be pretty stiff.

Pull right near the buttpad for best leverage. To FOLD the stock, you use the button.
 
I only got a cheap PDF printout for my manual. Needless to say I was a little dissapointed after looking at all the other extras that came with it. You can find a couple different ones online, such as the 551/552 one above, or this 550/551 version here
http://www.sigsauer.com/upFiles/CmsContent/documents/OwnerManual/SG550551OM.pdf
http://www.mg-42.net/manuals/550_551_SP_manual1.pdf
You can easily find other versions online too, such as the full auto one and the armorers manual.

With the folding stock just give it a good hard pull to open it back up. You won't hurt anything. It only locks in place with the stock in the normal position.
 
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