45....Engage!

Not a Canon but a miniature of a 4.5inch naval gun made by my son on his CNC lathe and milling machine as part of his apprenticeship, The cap is from my 50mm prime so you can see the turret is about about 1.5 cm across, the barrel is 3cm with a 2mm diageter, pretty tricky to turn down. oh and the whole thing turns on it's base