Safety first!

Rule #3: Keep your finger straight and off the trigger until you are ready to fire.

This is remixed from soozafone's Dummy 13 found here: https://www.printables.com/model/593185-dummy-13-printable-jointed-figure-beta-files
I just combined the open hand and grip hand models.

I scaled mine to 122% to fit my G.I. Joe Classified and Action Force gear.

*Note: Bambu Studio gives me the “Fix Model” warning, but I'm on a Mac and don't have the fix feature. It seems to print just fine though. Hopefully it won't be a problem for anyone.

*Also, the gear (gun, helmet, etc.) pictured on Dummy 13 is not printed. They come from G.I. Joe Classified and Action Force figures.