MPC Rail Gun

This model is about 1/64th scale is my guess. 

There are several nearly identical guns from 10, 12, and 14 inches caliber.

The model is not actually made to rise up and fall back like a disappearing rifle would normally do.

It works with a variety of figure scales, here with MPC ring hand figures.

I think it works just fine, as maybe a 6 inch or 8 inch gun.