DigitalNoob

In Call of Duty: Black Ops 2, one of the features added to the weapon attachments for assault rifles and sub machine guns is the “Select Fire” switch. Using the “Select Fire” switch will let you change weapons that are normally only semi auto or burst fire into full auto weapons. This can be a benefit as most of the semi or burst fire weapons have higher damage per bullet. The only drawback is that when you put these weapons in full auto mode, most of them have pretty slow rates of fire and higher recoil. Experiment and find out which combination works for you.

The Select Fire Attachment on the M8A1 Assault Rifle