The file 'Smith And Wesson Shield Magazine Extension +1 And +2 3D Printer Model' is (stl) file type, size is 1.7MB.
This was remixed from the following user: https://www.thingiverse.com/thing:2810236
I have updated it to fit a little better and found that I dont really need the plug he included.
If you print this for the the 7 round magazine it will give you 1 extra round and if you use the 8 round magazine it will give you plus 2 rounds. Your option to use as 8 +1 or 10+1.
Slight interior trimming will be required to insert the magazine base plate to sit flush in this extension, I used a Dremel and cleaned it up until I modify the file again.
Update to come: Make a taller version for the standard 8 round magazine and have it follow the contours a little bit better where it meets the firearm.
shield_magazine_extensionrev_2_revised_2.stl | 7.7MB |