Anything is CO2 compatible...whether or not it's CO2 survivable, and for how long, is another issue.
Unless it was a model that tickled my fancy...I'd lean towards a TM.
If the TM hicapa was upgraded...I'd really want to know how/what went into it. Not all parts are created equal (i.e. any old metal slide is not necessarily going to be the same as a quality metal slide). If you expect it to function well...most times you can't just drop in parts and expect it to work well. Gas systems are a pretty fine balance of parts, power, fit.
I'd rather get a stock gun and a bag full of parts...than to get it thrown together randomly.
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