Murx,
You mention the 7.62mm (.308 cal fur us non-metric folk )The gun is the AR10,
developed by Eugene Stoner after WWII.
Made it into limited production in the mid 50's . I have 2 of them babies---
SWEET !! (now to different AR10 rifles are being made today...
I used to own and service full auto weapons
and have played with most of these toys,other than the FG 42 .
Anyone near Knob Creek , Kentucky must go to the MG shoot , or go to the Sold of Fort convention on 'Vegas ...
Anyways -- back to the "_ORIGINAL_" start of this thread ... the MP/StG43-44 weapon was another example of over-engineering with machinework. For a country being pounded to pieces and running out of supplies, and also considering the poor training the last recruits were getting ... the MP40 made more sense in the last days of the Third Reich.
The StG45 was the best of the light auto weapons , time ran out ... the german G3
owes its basic design to the StG45.
Abrams