Receiver support block:
Made from standard C360 Brass. Nothing special here. the block is made to just barely fit in the minimum specifications of the Luger Receiver. The two guide rails that protrude .055" I later revised to .045" for extra clearance. all dimensions that do not have specific tolerances are +/- .005, everything else as labeled. The most critical dimensions (to me) are the width of the block (.512) and the dimensions and exact location (relative to each other) of the two guide rails. The height (.866) is largely irrelevant, but will end up perfectly flush with the underside of the receiver and the very top of the ears.
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