When I was shopping for a chassis for my 12FV, I landed on Masterpiece Arms BA Lite as the one that would get my dollars. I called them and asked a few questions, got answers. I since invested in a Tikka, so I never purchased it.
Here is a link showing the 12 action in their chassis: "https://masterpiecearms.com/shop/mpa-ba-lite-pcr-competition-rifle/"
Hoped this helped point you in the right direction.
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