The Hinderer Firetac is a reintroduction of the Firetac model which was first designed and produced over 15 years ago. For the new Firetac, the design was upgraded to include "lessons learned" from the XM-18 series. These upgrades include features such as larger handle screws, different design with the standoffs, and the addition of a hardened steel lockbar insert. The thickness of the blade has remained the same from the original design. Instead of having the normal flipper that Hinderer is known for, you will notice the addition of a thumb disk instead. As with all the latest Gen hinderers, include a Stainless lock insert, and of course still has extremley smooth action.