Sorry about that, it's the elfin knights, an airsoft model that fires tanaka shotshells which are precharged and hold 2-3 bbs, the fill valve is on the back of the tanaka shell where the primer would be, instead of a firing pin its just a nub that sticks out and pushes the area around the fill valve which releases all the gas into the shell(requires a special loading key so you can charge it with gas without purging it as soon as the nipple finds the valve) when you pull the trigger
The eflin has no barrel. BBs and gas discharge directly from the tanaka shotshell into the air in an impres