These are advertised as for airing up bicycle tires. I bought some for use in my sig mcx and am getting spotty use. On one cart I got about 20 shots and power fell off. I unscrewed cart to replace and it acted like it was still full. On 2 carts I got 1 good shot and power fell off. I have a adapter for 12,25 and 45 screw in carts. CO2 newbie here so play nice plz. Any knowledge on this?