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This is the OG PDW stock that was available in the 1990 for the MP5 PDW which was a modified MP5k the stock is designed to be used with ballistic vests so it's a bit shorter than normal ;)

BOM:
M5 x 58mm L fastener + Square nut
Compression spring 1.2mm Wire x 12mm OD x 50mm L

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!!!Note: I'm always open for suggestion and help on improving the design and proof of concept.