Some (many?) of the pre–Great War guns had "gas dickte mutter bolzens" (sp) installed later, after the original "hound's-tooth" Schlag stuck was shown to leak gas and are not original to the gun. The Brits were the dominate force in English language literature but there was a lot of scholarly non-English work published. I've noticed Cape guns have the rifle barrels on the left side, but BFs have the rifle barrel on the right and have ruckstechers.

Mike