Something I just saw today, for people living in communist states that hate firearms.
With the same ease as changing a BCG, dropping in the Kali Key removes your direct impingement AR from the definition of an “assault weapon” as defined by California’s Assault Weapons Control Act and other state laws. It does this by converting the firearm into a straight-pull bolt-action rifle. For AR10s and AR-15s, comes with or without a BCG, so you can just swap out your existing bolt carrier key, or have a spare BCG to switch back to semi-auto. The handle attaches to the notch in the new key and you slide the unit into the AR, converting it it to a straight-pull bolt-action. And bolt-action rifles and pistols don't have to be "featureless"". MSRP = $102.95 for either the ERGO or LO-PRO version without a new BCG for AR-15s and $10 more for AR-10s. I hate the reason that things like this exist, but like the fact that it does, so people can still shoot ARs, even if they aren't "fully semi-automatic", whatever that is.
https://kalikey.com/products/