Snap action actually refers to any gun that locks up when the barrels are closed. For example a top lever gun is a snap action. The push forward lever under the trigger guard operating the Purdy bolt was sometimes used before, or as an alternate to the Scott spindle. My Rigby has, in my opinion, has the perfect push forward underlever. It withdraws the bolt and cocks the hammers when opening. The barrels just fall to the open position. Self opener anybody? Insert cartridges, pull barrels up and it locks up. I think this is the perfect system for a dangerous game rifle. Excuse any typos or grammar errors; 4 beers.

Dave