Run with the Fox: Most guns use the forend to activate the cocking mechanism, which shows up in that most guns you need to remove the forend to dismount the barrels. The forend causes the cocking mechanism to engage the hammers and cock them as the gun is opened. Sometimes the cocking mechanism doesn't let the hammers fall all the way you would see in a gun with hammers down and barrels off. The only way you can tell if it is happening is to examine firing pin protrusion with the barrels and forend I place. Hence the rod to measure the pin protrusion. I don't think it has anything to do with the method
of forend attachment, ie, spring or latch, IMHO.
