9mm pdw coversion kit

All you need is a lower and you can make your own 9mm pdw.

Maxim defense pdw brace ($350 new)
Strike Industries pdw buffer and buffer spring ($72 new)
Stern defense ar15 conversion block ($180 new)
Complete 9mm upper w/bcg and charging handle ($200 new)

I’ve got over $800 invested, asking $500 obo. Open to trades, but not really looking for anything in particular.