I bought the bottom metal on Ebay. It is one piece steel, has inside bow release, straddle floor plate and matte blue. I have had it on an action and the magazine box fits up inside of the side rails. I have never seen anything like it. It is nice. Maybe someone can identify it for me. I dont know how to post pictures but I can send photos.

Is the trigger guard and floorplate the correct width for a M70?

Yes-Its made for a Pre-64 M70

Sounds like a Williams, which is no longer made. I am looking for one or two. Lots of dead ends out there.

It could be a Williams but I dont remember it looking like this one.

I just looked at Williams last web site and-yes it seems to be a Williams Bottom Metal for a Pre-64 M70.

Blackburn made his M-70's with the mortise for many years...Later eliminated it as unnessary....