It is easy, all you need is a set of snap ring pliers. If you don't have any you can use a flat blade screw driver. Stick it in the slot and carefully twist untill the ring comes out of the groove. Don't be scared just be carefull.
I have the M1014. I also have the pistol grip stock. It will fit without any mods. You just spin it off and the other one spins on. The mag capacity is 7 +1 float and 1 in the chamber.
Here you go. I think this will work. It's not camo, but it's the only one I've seen.http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=73957&item=7143125775&rd=1