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Established 2006. Kent's Only Authorised 5.11 Tactical Retailer

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The Winter Magazine

CO2 sits at a considerably higher pressure than green gas and, more importantly, holds that pressure far better as the temperature drops. On a January game day a green gas magazine goes soft and the slide starts short stroking. A CO2 magazine keeps cycling. If you play through the winter, this is how you keep a gas pistol in the fight.

It Fits More Than The M17

Worth knowing: this is listed as an M17 magazine but the Proforce platform shares magazines across the family, so it also runs in the P320 X-Carry. If you own the X-Carry, this is a legitimate magazine for it and not a compromise.

The Trade Off

CO2 is harder on internals than green gas because of the higher pressure, and it raises velocity, so re-chrono after switching rather than assuming you are still where you were. Some sites also restrict CO2, so check your site rules. Our Rochester range will chrono it for you.

Spares

Gas pistols run dry quickly, and a magazine holds both the gas and the BBs, so when it is empty you are out of the fight until you refill. One spare is sensible, two is better. More in our gas and BBs range.

General
BrandSig Air
Other
TypeCO2 pistol magazine
FitsSig Proforce M17, M18 and P320 X-Carry
PropellantCO2
Ammunition6mm airsoft BB
Age restriction18+

Frequently asked questions

Will it fit my P320 X-Carry?

Yes. The Proforce family shares magazines, so this M17 magazine runs in the P320 X-Carry as well as the M17 and M18.

Why choose CO2 over green gas?

CO2 holds pressure far better in the cold, so the pistol keeps cycling properly in winter when a green gas magazine would go soft.

Will it change my FPS?

Yes, CO2 runs at a higher pressure and will raise velocity. Re-chrono after switching, and check your site allows CO2 before you play.

Is CO2 harder on the gun?

Somewhat. The higher pressure puts more stress on seals and internals than green gas does. It is a reasonable trade for winter usability rather than something to run all year.