I am an ar guy, I was thinking of selling the rest of my bolts to buy more ar's lol. I'm not a big 223 fan though, so most of mine are in other calibers.
But really, buy what you like to shoot. Nobody can predict what's going to happen. I can see several scenarios playing out but I have no idea how it's going to go. There is a scenario where, with Biden's plan to have all ar's, ak's, etc registered as NFA items, with no more being produced, the value would eventually go up dramatically like machine guns did after 1986. However, that's assuming they don't use the registration as a confiscation tool, which they would undoubtably try to do.