I'm not aware of many mods in this size with a recessed firing switch, but of the clones I've seen, the King and the Mutant immediately come to mind. The King has a locking ring and the Mutant does not. Then there's the Manhattan/Fuhattan which doesn't have a locking ring and the switch isn't exactly recessed, but it won't fire under its own weight while standing on a surface.
I own only two 26650-sized clones, a Hades and a Congestus. The Congestus clone came from
fasttech and it's very good quality for the price. The firing switch protrudes from the side towards the bottom, and it even comes with an extension tube to cram in two 26650
batteries for crazy amounts of power. And it looks like a lightsaber which is a plus for a Star Wars fan like me.