Have you guys seen it?  Replace the bolt carrier and charging handle and you've got a straight pull bolt rifle.  All they really did was eliminate the gas key on the bolt carrier so the gases going into the upper does nothing.  Need semi?  Drop in the original bolt carrier and charging handle.

I've no financial interest in it but if I was still in Californiastan, I'd install them (or make my own) just to stay legal.

https://kalikey.com/