You forgot PGI! Everybody wants a Firestorm! They replace the frame also. and the bolt, and hammer, and the whole front block.
PMS had a Grip that released the sear then used 2 2-way solenoids that were activated by just a micro switch behind the trigger. It was really cheesy I guess. You could take the racegun front end and copy that. If you can fit a 6v lithium battery in the grip.
And the Electro frames make the hinge look long, every one of them.
"If you build it, they will run"
Colin @ Deadly wind: “We need to stay away from each other. You scare me.”
Owner of Patent #7610907: Paintball marker action assembly