I doubt there are two triggers. The forward handle doesn't look like it has one.
Did you read what he said. "Trigger" means that there is a pseudo-trigger, not really a trigger in terms of a gun trigger. As I think I said earlier, that's how it works. Exactly how DBNF described it. There are a million different airsoft "shotguns" that work the same way. You either pump, pull trigger, pump, pull trigger, or you pull the trigger and hold it, and you pull the handle back to prime, then push forward and it fires when the handle is all the way forward. Because there is an internal tigger, there are two triggers which both need to be depressed in order for the gun to fire. If you want to see the internals in terms of how that mechanism works, buy a cheap airsoft shotgun. It will be exactly the same as this gun, just with tinier internals since BBs don't weigh as much as darts.
Now that I got that out, I will probably never visit this thread again. Good day.