I recently ordered the last black Cryos M2 head from Oveready, along with a Teva cren five ring, and UCL lens. I lucked it when it, a SF Z2 incan, and SF combat rings arrived on the same day. I then proceed to have lots of fun Lego'ing the lights...
I put a Thrunite single-mode XML in the Cryos M2/Z2 setup and added the hooked combat ring, which provides a nice balance for the heavier head. (I'm still on the hunt for FiveMega Penta tailcap.) The basic combat ring on the 6PX Pro 9/11 Edition gives this light a Z2 feel, and makes pushing in 'constant on' much easier. The black G2Z got the Z2's aluminum head with a P60L.
Regards,
Ira