You may have to reposition the LE in your A19 head, the lip of the can should be flush with the back of the head...Added a KL4 and a McTC to my non-collared, natural body and it looks decent. Color match with the McTC's is good. I'd prefer an A19 head, but I haven't come up with a magnet/spacer that works with that head yet. I'm using one of the larger Leef spacers with the KL4.
Had a little trouble with the 18650's. Three of the four AW cells I have and the one older, blue no-name cell shorted against the body near the tailcap. The problematic 18650's have very little insulator/wrapper on the tail end (much less than any of the CR123A's I checked). I tried a quick fix with an o-ring, but I would have had to stretch the tailcap spring. I guess if I have to use those cells, I'll just cut a doughnut out of electrical tape. Fortunately, one of the AW cells had just enough insulator.