Talk:List of equipment used by the enemy/@comment-137.132.3.8-20140417143734/@comment-111.100.31.23-20141005173404

Because even a lot of the allied AA guns used metric measurements as they were made in Switzerland or Sweden, with the Bofors 40mm being Swedish and the Oerlikon 20mm being Swiss. It's really only the American and British guns that used imperial units, and even then a lot of the British guns used projectile masses rather than bore diameters.