a pair of sockets, each socket being in fluid communication with a pressure source;

an entangling projectile including a pair of anchors connected by a tether, each of the pair of anchors being positionable within one of the sockets and the tether being carried by the cassette;

each socket carrying a slidable piston positionable in a respective socket between an entangling projectile and the pressure source such that each slidable piston is propelled along a respective socket in response to a pressure wave generated by the pressure source to thereby expel the anchor from the socket; and

a piston stop positioned at an end of each socket, each piston stop preventing a respective piston from exiting a respective socket, the piston stops each including a lip extending radially inwardly into an end of each respective socket, each lip extending only partially about a circumference of each respective socket, so as to define a tether notch opening therein.