Dropping the Sentry Gun in Modern Warfare 3 (Wii): Not Possible

You cannot manually drop the Sentry Gun in the Wii version of Call of Duty: Modern Warfare 3.

Why

• The Wii port has a simplified control scheme and lacks the equipment-management depth of the PS3/360/PC versions
• No button combination or menu option exists to deploy or discard the Sentry Gun manually

How It Leaves Your Inventory

• Destruction: Enemy fire destroys it
• Respawn: All equipment resets on death

The Wii version has several limitations vs. other platforms—this is one of them.