When you look at the video, you can see a red and black wire going from somewher to near the top of the solenoid or somewhere.
They do it for testing purposes...tho, I would think that they would say "its very bouncy"
But, i have to say, that owning any marker, airgun or firearm, in this country that is capable of Full auto or burst (not including airsoft as they are classifide as toys) could get you 10 years in the big house mate...proper...it becomes a section 5 firearm..even owning a component part of an illegal firearm can be enough (ask john sosta about the AK47 stock!)....which could mean that the bolt from an american Race frame, could be a component part...very naughty!
But basically you have to bypass the sear, or something like that..tho in istself that wont work, coz it will run out of steam.