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[–] SpaceOctopus [S] ago 

Quite possible.
I wonder what happened to the rest of the cannons. 22 were built, eight were used in France and three at the canal. I have no idea what they did with the rest.

The K5 cannons used in France were also titled "Paris Gun". Which is a somewhat ambiguous name as it describes multiple different cannons.
The largest of the Paris Guns is unique and a very interesting construction. With an incredible effective range of 130km (81mi) it fired the projectile through the stratosphere, making its projectiles the first human-made objects to ever reach the stratosphere.