Well, if you're looking for a pistol to handle both propane and CO2, you should look into KJW pistols. Most of the pistols have the upgraded red nozzle which is meant for use with CO2.
Out of the box, I most KJW pistols will handle CO2 except the 226. All Hi-Capas, M9s and 1911s have CO2 mags available for them from KJW, and come with the upgraded red nozzle.
If you do proceed with a KJW, try to stay away from the ones with plastic lower frames, unless it's a 1911. The 1911 was designed with a metal interior chassis, which shouldn't break the plastic lower as easily.
TMs were not designed for CO2, if you choose to run CO2 on your TM, it will probably break prematurely in spectacular fashion.
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