Update on the Stingray X!
I took the button apart to find out what was so right about it. There are TWO channels 180 degrees apart for rice pins! This stabilizes the button with no modification needed since the bottom button post has two parallel rails (rice pins) to ride on going up while firing. The magnets are strong enough to let it stand unlocked with a Merlin RTA installed without firing.
This thing was stupid cheap at $13 shipped, SS covering copper tubing threading for 18350/18500 that is darn near impossible to see. A winner in every way.
It came packaged in a square black box that looked like the one in this listing except for the box color:
Steamgear Stingray X Copper Stainless Steel Mechanical Mod
Even the box art is the same as is the tip and hybrid adapter and plastic tube wrap. Price unfortunately is higher.