Semi-Auto Safety Plug

My gun shop had run out of safety plugs for Semie automatics, So I thought I would make my own and share it with the community. I printed at home and Tested it out on a day of clay shooting and it seemed to work great.

You may need to resize it a bit as my printer loses 9% somewhere between the save and the print.

This is also my first ever design to print! So if anyone has any tips, please do share.