My daughter's 20 gauge Superposed Lighting often fails to fire the 2nd barrel because she doesn't have enough mass to make it kick over.
It's interesting how this phenomenon works. The recoil of the gun requires enough mass behind it to give the inertia block a "nudge" to move. I've seen the same thing occur with the gas operated action on a perfectly good Remmie 1100 in 20 ga. My grandson was so slight of build when he first began using it, at age 9, that the action would not cycle and reload. No amount of cleaning and lubrication would fix that. I even enlarged the gas ports slightly, to no avail. It would cycle perfectly when I shot it, but not with him. When he got older and heavier it began to work perfectly for him.
