Flak Steinhauer & Luck 3 Pieces?????

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Hi I would like to have the reply of the most expert & non in this field.
Today I got my new opitc macro for my camera and takink picture of this classic Flak S&L made I noticed an interesting Thing ........aso the gun is a separate piece and soldered to the badge.I can pove this becose in side of the right roundel you can see an open port ,just a little upper in the low part of the recoil tube you can see the the solder .
My question is it's a special piece or was common to this factory to maake the gun as a separate part? Other factory did the same????
Sorry for so many pics but I would test my new optic
Carlo

PS
sorry for my bad english to expain the matter

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