I own a regular Seraph 6 (not Ti), and it makes a great host. It will take an 18650 without boring, and with the 1½ adapter, can be built to take almost any combination of 18650, 18500, and 18340 cells. The same with the Seraph 9. Right now Lumens Factory has host versions (no lamp assembly) on sale for very good prices. Each Seraph includes both a twisty and clicky tail cap, plus extra O-rings. For 3amp and over loads they recommend using the clicky tail cap only. LF also has a C to M adapter so that one can use M series heads with the C Seraph bodies. And they are a great company to work with. Mark, the owner, has a presence here, and will pop in from time to time. Every time I have asked a question (by email) I have received an answer within a day or two, many times from Mark himself.