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The W1200 is a pump action with good damage, and the M1014 is semi-automatic and in COD4 is the gun that gets the gold camo after all shotguns are completed.

The W1200 boasts a higher one-hit-kill potential at optimal range but requires manual cycling after every shot, reducing it's fire rate to 150RPM.

The M1014 has double the fire rate and a slightly longer range before the pellets disappear but has a lower chance of scoring a one-hit-kill.