Originally Posted by Akers
There are numerous threads on it.
You have to build it as a single shot and then convert. Single shot means no gas tube and a bob sled or similar magazine.
This is a very basic answer, I can find a thread and post it.
Remember to follow all CA laws when doing so and document the transition from single to semi.
there is no requirement that it not have a gas tube.
SSE handguns are sold everyday in CA with functioning recoil systems. A self-ejecting single-shot handgun is still SSE if it is dimensionally-compliant.