You are correct that current Calif. laws do have an effect on what gun companies do nationally. While the warning on Ruger barrels is older than current Ca. laws and was the result of a lawsuit that was brought in Alaska, the Ca. laws do require mag disconnects on new production guns coming into the state (but not 1911s or older designs even if new) and a few other objectionable things.
Ca. has led the way in figuring out how to add on more taxes and charges to buying a gun than other states. Each year gunmakers must submit a gun for "drop tests" and pay $5,000. for the privilege of selling a gun in Ca.
New York and Mass. laws gave us the fired case in the box all guns come in.