Post this in the black rifles section and you'll probably get a better response.
(never mind, appers a kindly mod has done it for you.....)
I don't have a link, but its fairly easy to do. The typical AR magazine has a removeable floor plate. There will be a small hole on one end. Gently lift it up and slide it over the lip of the mag body. The spring will be under considerable tension even unloaded so watch yourself. When done, you will have the mag body, follower, spring and base. Reassemble in reverse order.