[Drakker]

You can use both green gas (which is propane really) and CO2, true, but the green gas performance will be degraded because the springs used to accommodate the CO2 are much stronger than is optimal for green gas. This means you will get less shots than you would with a weaker recoil spring, and to some extent, a weaker hammer spring if the one you have is particularly strong. The thing is that the KJW 1911, even those with weaker springs for green gas, are not great performers. The slide is so heavy that you will hardly ever get a full mag out of a gas charge unless its over 30?C outside. If you play with real capacity (7 or 8) or in limited ammo games (usually 15 rounds) that will not be a problem, but you are unlikely to get the full 24/29 rounds of a mag with green gas. So, yeah, with that said, green gas would put less wear on your pistol. Normally I'd be telling you that green gas is so much better than CO2, but for this particular pistol, if you can deal with the hassles of CO2, its the better choice.