- "Tube extension carries an extra 2 rounds of 12 gauge with a very slight weight increase."
- — Description when used on the Model 680
The Tube Extension is an attachment available to the Model 680 in Call of Duty: Modern Warfare.
Another variation, Tube Extensions, is available to the R9-0 Shotgun, which carries four extra rounds instead of two due to the double-barrel design of the weapon.
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