I just wanted to say I recently ordered some Z32's, rings, and pentagon tape switches from Brightflashlights for my SF G2's.  I converted them to weapon lights and they work great.  Calvin, excellent customer service.  I got my order quick and had a prob with one of the tape switches.  I called him up and he sent another one right out with a prepaid envelope for the return.  Awesome!! I got the replacement now and I'm all set.  I'm very pleased and recommend Brightflashlights.