The guys over here at Print3D.world are not only 3D Printing enthusiasts, we also are gun enthusiasts and enjoy our Polymer80 mods. This is an add-on that a lot of Poly80 builds are missing, and they definitely add functionality. You will no longer catch on the back of the grip when inserting the magazine! Download the FREE Poly80 grip plug below, and print it on your 3D printer.
Thingiverse:
https://www.thingiverse.com/thing:2709850