It appears to be an older one, but the trigger frame's aftermarket (as you can tell by the PTP logo on it) I wasn't aware they made frames for the sterling. It's probably not firing because it can't cock. I don't see a screw ahead of the trigger frame. That lug that the hammer carrier? (Never learned the formal name for that component) runs through from the pump handle isn't screwed down.
Originally Posted by Jordan
Love how the thread got de-railed to incestuous relations and soldering brass tubes together. Classic MCB at it's finest.
Originally Posted by HP_Lovecraft
I'm no hippie, but I do lack any sense of style.