The 870 12ga in the pic is mine that I made for home defense out of a wingmaster. great shotgun and I love it, and my uncle did as well when I carried it while killin some hogs a couple weeks ago. He has a 20ga 870 wingmaster that he wants me to turn into a home defense gun just like mine.  I have a WC +2 mag extension on mine but I have not seen them for 20ga. does remington make a factory extension for 20ga? I called 3 times in the yesterday and day before and was on hold for 20+ minutes before I hung up...
Thanks

Yes, they sell a 18" express model with the factory +2 on it so they can sell you one.  If they won't Choate makes all different kinds for the 20 gauge.

http://www.brownells.com/.aspx/pid=4203/avs%7CManufacturer_1=CHOATE/Product/SHOTGUN-MAGAZINE-EXTENSION

I have a Choate on my youth 20g and it works well and is well made.

Thanks guys i just overlooked the remington factory for 20ga on brownells somehow...Got what i need thanks