So my G26 could also be reconfigured in .40S&W and .357Sig? What's involved in making this kind of change? I saw mention of ejector and mag change required but apparently a new slide too? Is this something that can be done only by Glock, by an armorer or is it a pretty basic thing? Are these parts readily available? I saw the thread that if it were a G27, only a barrel and mag change would be needed to convert to 9mm. This sounds more complicated but is it economically feasible/worthwhile to switch to bigger calibers?