Pmag +8

File is pre supported at optimum printing angle for strength. Allow slicer to generate additional support as necessary, unless you have a well tuned printer.  

You'll also need to file the nose of the mag follower as shown, this can be done with a small round file. This prevents the follower from catching the lower edge of the forward spine inside the Pmag body when the follower travels up and down past the part line.