Dave,
I called remington, and they sent me a manual for my 788. It was a photocopy actually, but pretty useful. You might want to give them a call and see what they tell you.
Anyone use the iron sights on these? Mine came with irons, but i removed them and used a Leupold 3x9 for a while. I now want to switch back to irons, but my rear sight is broken (split in half). I am told that Ashley Outdoors has some that might work.
also, i got the 1 piece base from CDNN Investments for $2. It is a Tasco aluminum, but it was all i could find in a 1 piece design.