I'm trying to establish dimensions from a set of photographs.

http://www.postlerferguson.com/work/paper-oerlikon

The pictures are of a model of an Oerlikon 20mm twin anti-aircraft cannon. (Made
entirely out of paper)

I wanted to model it in POV, but I can't find any dimensioning information.

All I know for certain is that the shells, which are contained in the boxes on
top, are 0.8 inches in diameter (which gives the inside diameter of the barrel)
and between 6 and 9 inches in length, depending on type.

I estimate that the Muzzle Brakes are about 18 inches long, but if I'm right
that would make the barrel alone about six feet long (without the Muzzle Brakes)

Any assistance would be appreciated.

Regards,

A.D.B.

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