A surgical instrument including a housing, an elongated portion, an end effector, a drive beam and a force applier is provided. The housing includes a first actuator and a second actuator. The elongated portion extends distally from the housing and defines a longitudinal axis. The end effector is disposed adjacent a distal portion of the elongated portion, and includes a first jaw member and a second jaw member. The first jaw member has a cavity defined therein. Actuation of the first actuator causes distal translation of the drive beam to move the first jaw member relative to the second jaw member toward the approximated position, which applies a fist force against tissue disposed between the jaw members. Actuation of the second actuator causes distal translation of the force applier such that at least a portion of the force applier moves into the cavity of the first jaw member and applies an additional force against tissue disposed between the jaw members.