The blind mag well has been done and turned out as well as I could have hoped for.
This is the slow wedge so that when I am routing it down I know that the well will be paralell to the bottom of the stock.

You can see the block that locates into the recoil lug area

There needs to be a means of holding the guide plate to the slow wedge so a length of 2x1 1/2 (cramping blocks) along each side has a notch cut in it to take the ends of the locating block. The top plate was screwed to these cramping blocks and with the notches and screw locating points I can be sure it will all go back to the same configuration on any stock I care to do the same thing to.

The router guide area cut into the top plate was cut undersize at first and with the stock in the vise held by the cramping blocks I could take the top plate off and it would go back into the same place again so I could gradually open up the guide area to leave the correct size well.