Help me identify strange and perculiar

[FrogMan]

I think I figured it out, this was clearly made to connect to a Hydra artillery ray gun, the scale is in millions of miles and is there to adjust for gravitational affects on the Rays. Since periscope does not have magnification I must assume that the ray is expected to curve around the earth at least one full rotation before hitting a target thats right in front of you.

 

[FrogMan]

I have the thing 98% dissembled and Im leaning heavily towards prototype as almost no parts seem to have been finished with the exception of the Sear/Lever assembly which is both blued and marked with "CN" on one side and "M" on the other so I think the below part is going to be my best bet to at least identify origin if not purpose.

 

[StuP]

Not all war production was that well finished cosmetically, especially as, in and off, itself, it wasn't a weapon. Possibly the sear was used in more than one device.

 

[FrogMan]

Not all war production was that well finished cosmetically, especially as, in and off, itself, it wasn't a weapon. Possibly the sear was used in more than one device.

Yes i figure thats why its marked and finished so it might at least help identify where this came from if not what it was for.