A big breakthrough courtesy of trapexit, who has been adding arcade game support to the 4DO libretro core.

4DO is a 3DO game console emulator. In addition to this, it can now also run 3DO arcade games such as Mad Dog McCree 2.

You can use the mouse in order to simulate the light gun with this game.

See trapexit’s blog article here for more details –

http://spawn.link/3do-arcade-saot-bios/