John,
The 1937 receiver and complete toggle were made from similar steel and were machined from raw forgings. Steel type St C 25.61.
The toggle front-end was machined from a standard 5 meter long DIN-sized (DIN 1011)forged steel bar of 22x18mm in diameter, also of steel type St C 25.61. They were able to make 92 toggle fronts from this 5 meter bar.
The postwar Mauser Parabellum receiver was made from a forged part (I've inspected a raw forging in Oberndorf), as was the toggle front-end. The mid toggle and rear toggle pieces were castings.
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