....then you design/lighten the barrel as in the .223 design and it should work. After adjustments to booster-cup("Nozzle") front-hole and possible the size/length of booster-cup("Nozzle") rear-slots for "timing" of pressure-drop.
I fully understand about the other parts needing to be changed and/or lightened........to include top-cover/feed-tray, bolt, recoil-spring, barrel, booster and barrel-bearing("Nozzle"), sights.........posible buffer.
This conversion (in any of these calibers) should not be much different than the 5.56mmNATO/.223 conversion for the M60 that I was told was being producing a few years ago as a limited run by a small manufacturer.
Regards, RichardS in MI.
Blanksguy2001@chartermi.net
MG42 in .223
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PM
Re: MG42 in .223
Yes John Weaver was making .223 conversions for the M60 before he died. I've owned 2 of them. They were crudely modified/welded USGI parts and marked with electro pen. He made his own barrels. .223 Ran fast in the '60 but got way too hot to hold very quickly...