Most of the Galco holsters I've seen have a nylon/plastic belt clip... and yes, I'm obviously talking about IWB holsters. In the past I've carried an S&W Model 39 and an H&K P7, both in Bianchi holsters, both with spring steel belt clips. There's something about plastic, albeit nylon, that I just don't trust. I recently purchased a S&W Sigma 9mm and am looking for a Bianchi holster for it, but not having much luck finding one. I really like the looks of the Bianchi Model 100 Professional but they don't seem to make that model to fit the Sigma. According to what Mike.357 has posted, perhaps the Bianchi for the Glock 21 will fit the Sigma? As popular as the Glock 21 is, I'm sure Bianchi makes an IWB holster that will fit it, and perhaps the Sigma.
I just checked their site and it appears that they don't ... bollocks!