SIG SAUER CO2 12 Gram 40 Pack. These Air Rifle Accessories by Sig Sauer are an ideal way to make sure you're getting fresh air for your favorite pellet or BB air rifle. Having a reliable source of CO2 can make a world of difference for your air gun and your Sig Sauer CO2 is the fuel for your pellet or BB air rifle. Keep your air rifle or BB gun running with a Sig Sauer CO2 Canister. Specifications for SIG SAUER CO2 12 Gram: Manufacturer: SIG SAUER Additional Features: 12 Gram Package Contents: SIG SAUER CO2 12 Gram SIG SAUER Infinite Guarantee SIG SAUER AC-12-40: CO2 12 Gram 40 Pack