I saw that JSD Supply has an 80% fire control kit for Sig P320-style firearms and one coming soon for a P365. They look pretty interesting given the factory and aftermarket support for both platforms.
jsdsupply.com
jsdsupply.com
80% P320 Compatible Insert - MUP 1
Purchase a quality stainless steel SIG P320 insert from JSD Supply. Our SIG Sauer-compatible parts will have you building your next firearm in no time.
jsdsupply.com
MUP 247
Build your own Sig p365 with compatible parts from JSD Supply. We ship the MUP 247 fast, so you can build your DIY firearm in the privacy of your home.
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