Abstract: A folding blade knife which may comprise a handle member, and including at least one upper handle member and at least one lower handle member defining a channel. The knife may further include a blade member pivotally mounted, via a pivotal member, to the handle member and within the channel. An actuator may be slidably mounted to the at least one upper handle member and joined to the blade member back end, for actuation by a user, such that when the user exerts a force against the actuator to slide the actuator with respect to the handle member, the user-exerted force is transmitted to the blade member back end to rotate the blade member. A pin slot may be formed within the at least one handle member at the handle member front end and arched around the pivotal member. An actuator slot may be formed within the at least one upper handle member at the handle member front end, having a linear portion and an arc portion.