I just recently installed an SRT on my P220 (an amazing difference). I know that the Sigs that came with the SRT have to be field stripped differently. Now that my P220 has the SRT, it still strips down the same way as it did before the SRT install. Why is that? What's the difference with a P220 with an SRT from the factory, and the one I now have in my hand? Just curious.... Harry Wanna kill these ads? We can help!