I have shot the sig, it's what I carried for a few days when I was working at the PD. Everyone up there had one until they told them they didn't want them carrying such a hot round. My .45 has a thud when you shoot it. The sig has a crack to it. Good weapons, just way too expensive to shoot. If I had my choice, and when I got my G21 I was looking for the G22. Your gun, but in a .40. Same case just not necked down. Same clip and everything. I could change the barrel in your gun to a .40 and load up some .40 rounds and have a hayday. Another reason I wanted the sig lmao.