Streamlight PROTAC RAIL MOUNT HL-X (88066)

New Unit. Great light and will come with 2 cr123As (I may be able to find a panasonic 18650 instead). 

Comes with the pressure switch and all included mounting accessories. 

Lifetime warranty. 

I have this and the RM2, so whichever sells I am keeping the other. 

I did a side-by-side and the difference is:

HL-X = brighter hotspot and much farther through. Better suited if longer distance is a concern. It also can use 18650 batteries without issue. 

RM2 = Slightly wider flood but less throw than the HL-X. Much longer rail mount (I imagine it sits more securely if you have the rail space) but rechargeable Lithium Ion batteries are not officially supported.