Some may differentiate tactical stocks and chassis' but, here's a few that accept the bottom bolt release system.

https://mdttac.com/products/hs3-chas...nt=42963880070

https://xlrindustries.com/products/element-chassis

https://www.boydsgunstocks.com/
Boyds has all kinds of stocks available that will accommodate a BBR.

If I may ask, what are you going to do with old stock? If you're interested in offloading it, I'm in the market.