"Optimize Your Loadouts and Dominate in Modern Warfare 3 with These Best-in-Class Setups"

The Lockwood 680 is considered the best shotgun in Modern Warfare 3 when built correctly. The recommended attachments include the Crown Breaker Choke, Bryson Hammerforge Long barrel, Sawed Off Mod stock, Bolo Shells, and Express Light Bolt. The loadout also suggests using the Overkill Vest, Quick-Grip Gloves, Covert Sneakers, Ghost T/V Camo, Frag Grenade, and Stim tactical equipment. To unlock the Lockwood 680, players need to reach Level 4 and progress through 27 gun levels. The Riveter and Bryson 800 are mentioned as alternative shotguns with similar capabilities.