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A greased bolt makes for a better handling and quicker reloading in bolt-action rifles.

Insurgency: Sandstorm

"The greased bolt upgrade allows you to bolt your rifle faster."
— In-game description

The Greased Bolt is a chamber attachment featured in Insurgency: Sandstorm.

It reduces the time it takes to work the bolt of a bolt-action rifle between shots. The greased bolt upgrade first appeared in New World Interactive's other game, Day of Infamy.