+1. I also have a G32 with a KKM match barrel in .40 S&W. What a sweet combo - two calibers in one Glock; and the switch takes about a minute. The only difference that I have found is the need to compensate for a different sight picture with each barrel. The stock .357 barrel is very accurate and shoots to point of aim. The .40 barrel is also very accurate, but the bullets impact a little high, requiring a 6 o'clock sight picture to hit the X-ring. No big deal, although I have to remember to use the appropriate sight hold with each barrel. And it's a small price to pay for the versatility of two calibers.