Based on the search results, there is no clear consensus on the best shotgun in Modern Warfare 2. However, there are some shotguns that are consistently ranked highly across multiple sources. Here are the top shotguns in Modern Warfare 2, according to the search results:

1. KV Broadside: This semi-automatic shotgun is often ranked as the best shotgun in Modern Warfare 2 due to its impressive rate of fire and range.

2. Lockwood 300: This shotgun has top-notch accuracy, range, and damage stats, making it a great choice for a one-shot run-and-gun class.

3. MX Guardian: This fully automatic shotgun can dominate close-range gunfights and is capable of inflicting a ton of damage when encountering enemies up close.

4. Bryson 890: This shotgun has impressive damage and accuracy, making it a reliable choice for taking on multiple enemies.

5. Expedite 12: This shotgun is well-balanced and is about as good as any shotgun should ever be in a CoD game.

6. Bryson 800: This shotgun has the best recoil control, but the time between shots is an eternity, negating its only special statistic.

Its worth noting that the effectiveness of each shotgun can depend on personal playstyle and the specific game mode being played.