When I went to test the MG08/15 the other day out of the workshop I had one of those frustrating moments when something that worked fine in the workshop didn’t! The gun was firing groups like a shotgun at hopelessly low FPS.
I decided the issue was in a poor BB transition from the chamber to the barrel so a fix was in order to smooth this out.
Instead of one screw locking the barrel in place, which offset it slightly, I added another two screws to hold it centrally. This eliminates the step the BB was having to take to get into the barrel, causing that appalling firing pattern.
A quick test run at my local indoor site proves satisfactory! Just a little tweak to the hop nub should have this beauty field ready in no time.
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You can buy the face mask I was wearing in the second video in our Etsy store.