Professor Parabellums HSTS UNW Adjustable Buttstock
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Professor Parabellum's HSTS UNW Adjustable Buttstock

I can’t test fit this but the main components are the same as the tested FGC9 one so it should be alright see the models ...

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Professor Parabellum's HSTS UNW Adjustable Buttstock alternatives
Adjustable feet
VanessaE