Just an FYI: The term "firearm component" is used in the definition “firearm-related product” and that is only used to define who a "firearm industry member" is. In other words, "firearm component" is not part of the regulated parts. BUT...
This definition seems to be firstly focused on things like binary or crank triggers, but could apply to just nicer triggers. Then it seems to focus on things like fixed mag devices that help a person crack the upper receiver faster like the AR Maglock / King Pin combo or the Juggernaut Hellfighter kit for AR rifles and pistols. Then it mentions the devices of Section 30515 which are the “features” that make up an “AW” in California… things like barrel shrouds (handguards), pistol grips, thumbhole stocks, adjustable stocks, folding stocks, flash hiders, forward pistol grips, etc.. Lastly it throws a large net to capture just about everything else by adding "includes any other device, tool, kit, part, or parts set that is clearly designed and intended for use in manufacturing firearms". This is so vague and we don’t know if springs, detents, lower parts kits, muzzle brakes, armorers wrenches, special vise blocks, reaction rods, etc. are included or not in that last sentence.
Once we get clarity, this will probably include a lot of parts we commonly buy online. The new "reasonable controls" on sellers, especially the age and ID verification and shipping, will likely cause many online retailers to stop selling to California.