Abstract: A mechanical bowstring release device of the type having a trigger mechanism including a latch rotatable upon actuation of the trigger to release a drawn bowstring. A release device body has an interior cavity containing the bowstring latch member. The latch member is connected to a trigger which extends through a trigger opening from the cavity to a location outside the body portion. The latch member has an arcuate lateral rib. The cavity has corresponding arcuate grooves. The rib of the latch member is assembled in the grooves in the cavity for rotation of the latch member between a bowstring holding position and a bowstring release position.