I printed an RPG-7 replica from Thingiverse and needed a quick and easy way to display it. I found this one for a real RPG-7 that would work from Andrew Nelson, but I didn't care for the text and didn't need the screw holes. But that's nothing a couple minutes in Tinkercad couldn't fix. I mounted it with Command strips and it works great.

This is the RPG-7 model I used.

https://www.thingiverse.com/thing:4726553