That's a pretty nice trade. Now, about the CO2 mags, you *could* buy the GHK CO2 mags if you prefer using 12g bulbs. Or you can do the "Devilhunter" mod to your gas mags.
You'll need GHK CO2 knocker valves, these (
https://www.evike.com/products/36737/) fill valves, you'll have to teflon tape the gas tanks in the mags, and also you'll need an adapter like this, *without* a regulator on it.
https://www.evike.com/products/32585/
Being able to use CO2 with the benefit of being able to top off whenever you need is great.