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9mm C1

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"Classic submachine gun, close to mid-range. Slower rate of fire, with medium stopping power."
— In-game description

The 9mm C1 is a submachine gun featured in Tom Clancy's Rainbow Six Siege. It was introduced in the Operation Black Ice expansion pack and is available for use by the Operator Frost.


The C1 submachine gun is a "Canadianised" version of the Sterling SMG. It was manufactured by Canadian Arsenals Ltd. The C1 SMG was very popular and remained in service until the mid-1980s, when it was withdrawn and placed in war reserve stock.[1]

In-game, and designated as the 9mm C1, this submachine gun has an atypically slow fire rate at 575 rounds per minute. However, it makes up for this rate of fire by dealing 42 damage per round. This submachine gun is useful at medium range, but close range engagements will be difficult to achieve.

This slow rate of fire encourages the user to be more tactical in their plan of action, forcing them to a more methodical playstyle.

Weapon Attachments

Under Barrel


Tom Clancy's Rainbow Six Siege

  • Before Skull Rain, Frost used to hold the 9mm C1 incorrectly with the magazine as a grip.

Patch Changes


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