Surefire 12,
in truth haven't tried the others, but they have been 100% reliable through 200+ round of cheap fed bulk so far (stock gun). I ran some Buckshot and Slugs through them; haven't, tried any 3". 1 FTF but it wasn't mags fault shell was.. deformed . With its length, the vertical grip gets in its way if i try and Bang it out on reload, (only tried it a couple times once i cut down the grip I'm gonna be trying it a lot more) but the grip's kinda long for my hand anyway so no biggy.