Still on a search for a non bottom fire, non hybrid 20700 or 21700 metal mech. I can find squonkers that fit the bill but most are plastic. I have several of those. Looking for one decent metal one squonk or not.
SQ217, Krönig box 21700, and Vicious Ant Spade (has resin doors which are fragile, but full aluminum frame) are the best suggestions I can think of for metal squonkers. For a cheap metal squonker, the Athena is very inexpensive and full metal with an external locking switch, but is only offered in 18650.