On the advice of the great and powerful Jai Haze, one of my favorite YouTube reviewers,
I picked up an Eveon Tube Mech Mod for the very low price of $69 from VapeL1fe, his store. I love this thing. It is one of those tubes that adjusts in length for the battery. The firing pin is the entire lower shaft which also locks in place with one twist. I am not sure what it is made from, but it just doesn't get hot and it fires consistently and with great power. I think it is a steal at that price. It's easy to fire, comfortable to hold, and even though it is light, it is just a pleasure to use.