There may also a couple of other problems. For one, the slide rails on the commander frame are shorter than the gov't rails. Secondly (and maybe more importantly) the recoil guide channel is shorter on the commander model. For example, if you go the other way (from a gov't to a commander) you have to shorten the recoil guide rod channel. I don't know if the travel for the recoil guide rod will be sufficient. You may be opening yourself up to a boatload of functioning problems that could cost a lot of money to straighten out.