Interesting.... I have a PMKMS underfolder screw build. Its together but just for fit. Built on a vulcan reciever so will take it back apart and heat treat the ejector and trigger and hammer pin holes then paint it and final assemble. parts count same as yours except the slant brake which is Global Trades and kept stock piston.
Also have an AMD-65 but waiting for Global Trades new 1mm reciever to be done. Already paid for two of them.
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