Spas 12 speed loading shotgun
Photo of a regular spas 12 shotgun.
The locking mechanism to top bar where additional shells has been modified. The lock now pops in and out of the bar. There is a switch at the end of the bar to regulate whether it extends or retracts.
The bar has been extended to include six additional shells and the finished bar has been replicated a number of times and could continue to be replicated. The mechanism works by loading the sheets onto the bar then retracting the lock with the switch. You then discard or store the ejected bar and place a new bar onto the shotgun.