To those who keep reminding me to pump fast - I know.
I have personally fired more than 1 million rounds from a pump 12 ga. Part of my job at CIL was testing new ammo designs in various makes of shotguns. We shot a pallet of ammo through each. The technique was to shoot from the hip, with one guy shooting and another dropping a new round into the port on each stroke. I estimate a round ever 2 or 3 seconds - all day long, for a couple of weeks.
A 12 ga has some recoil, so the technique was to throw the gun forward and pull the trigger. The recoil would stop the gun. I would not feel any recoil. Don't challenge me to a shoot from the hip competition. We would aim at empties on the range floor.
If I pump this Canuck gun real, real hard, the empty will dribble out, most of the time.
It has an extractor problem and I will figure it out, once I have a spare part in hand.