[Theohazard]

I haven't tried it, but I hear it's fine.

But keep in mind you don't need subsonic ammo out of a pistol, just a rifle. In most pistols even hi-velocity stuff will be subsonic. I was shooting my buddy's Mk III with a Spectre on it, and I alternated both CCI Mini-Mags and CCI subsonics in the same magazine. It was very hard to hear the difference between the two.