Final answer:
The four shotgun actions are pump action, semi-automatic action, bolt action, and break action.
Step-by-step explanation:
The four shotgun actions in firearms are:
- Pump action: In a pump action shotgun, the shooter manually operates a sliding forearm to chamber and eject cartridges.
- Semi-automatic action: A semi-automatic shotgun uses the energy from each fired shot to automatically extract and chamber the next round.
- Bolt action: Bolt action shotguns require the shooter to manually operate a bolt to chamber and eject cartridges.
- Break action: In a break action shotgun, the barrel(s) pivot at the breech, allowing the shooter to load and unload cartridges.