I came across this, pretty interesting and in my opinion, a whole lot better than some clunky stock.
https://www.range365.com/compliant-and-fast-meet-ar-maglock/
QuoteThe system works like this: swap out the mag-release button on your AR for the MAGLOCK, and the magazine will only release when the upper and lower are separated. Install an aftermarket quick-release rear takedown pin, like a Hyperswitch or King Pin, and you can do mag changes fast as Eugene Stoner intended.
https://youtu.be/XaZCryXDVyg