I think Brownell's has a special tool for removing the stock. Might be better to spend a few dollars to keep from boogering something up. I have never seen a regular screwdriver wide enough to fit the nut properly.
There is a step-by-step disassembly guide for the 1100 over on the Shotgun World forum. Scroll down to the section called "I love my"----- Remington. It is a sticky at the top of the Remington section.
Myron
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