Turning a Stgw57 into a precision rifle at Gruenig Elmiger

Interesting that the barrel change is proprietary and couldn't be shown. Makes me wonder how it works, if those chunks of crud came out when the barrel was swapped. In the video, its around 24:15 I've found references to the barrel being threaded into the sheet metal receiver and a specialized clamp to twist the receiver off.
 
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