Had one - you'd be shocked at how much velocity you don't get out of these big, clunky things. Blowback is really not the way to go with a 9x19, unless you absolutely must.

Here's something you might not know - like at least one other HK design (compare the HK4 and the Mauser HSc), the Volkspistole was pretty much directly lifted from a WWII Mauser design.

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