A dispensing syringe for dispensing a two-component composition, comprising: a) a syringe body including, i) a first elongated barrel having a proximate opening for receiving a first plunger rod and a first exit port for discharging a first component of the composition; ii) a second elongated barrel having a proximate opening for receiving a second plunger rod and a second exit port for discharging a second component of the composition, the first and second barrels being arranged in parallel along the length of the syringe body; b) a plunger rod assembly including, i) a rearward stop plate, ii) a first plunger rod having an outer edge and an inner non- threaded edge, the first plunger rod having a forward-facing end portion for forcing the first component of the composition into the first exit port, and an opposing rear-facing end portion attached to the stop plate, iii) a second plunger rod having an outer edge and an inner non-threaded edge, the second plunger rod having a forward- facing end portion for forcing the second component of the composition into the second exit port, and an opposing rear- facing end portion attached to the stop plate, wherein the first and second plunger rods are arranged in parallel for joint movement within the first and second barrels respectively; characterized in that the syringe further comprises c) a rotatable, threaded knob for connecting the plunger rod assembly to the syringe body, the threaded knob having a through-bore with a continuous internal thread for engaging the outer edges of the first and second plunger rods, whereby each of the plunger rods (30, 36) has at the outer edge a series of teeth for engaging the internal thread of the threaded connector knob, whereby an axial motion is imparted to the plunger rods (30, 36) as the threaded knob rotates about an axis, so that as the knob is rotated, the plunger rods move together in a forward or rearward direction within the barrels. a) a syringe body including, i) a first elongated barrel having a proximate opening for receiving a first plunger rod and a first exit port for discharging a first component of the composition; ii) a second elongated barrel having a proximate opening for receiving a second plunger rod and a second exit port for discharging a second component of the composition, the first and second barrels being arranged in parallel along the length of the syringe body; i) a first elongated barrel having a proximate opening for receiving a first plunger rod and a first exit port for discharging a first component of the composition; ii) a second elongated barrel having a proximate opening for receiving a second plunger rod and a second exit port for discharging a second component of the composition, the first and second barrels being arranged in parallel along the length of the syringe body; b) a plunger rod assembly including, i) a rearward stop plate, ii) a first plunger rod having an outer edge and an inner non- threaded edge, the first plunger rod having a forward-facing end portion for forcing the first component of the composition into the first exit port, and an opposing rear-facing end portion attached to the stop plate, iii) a second plunger rod having an outer edge and an inner non-threaded edge, the second plunger rod having a forward- facing end portion for forcing the second component of the composition into the second exit port, and an opposing rear- facing end portion attached to the stop plate, wherein the first and second plunger rods are arranged in parallel for joint movement within the first and second barrels respectively; characterized in that the syringe further comprises i) a rearward stop plate, ii) a first plunger rod having an outer edge and an inner non- threaded edge, the first plunger rod having a forward-facing end portion for forcing the first component of the composition into the first exit port, and an opposing rear-facing end portion attached to the stop plate, iii) a second plunger rod having an outer edge and an inner non-threaded edge, the second plunger rod having a forward- facing end portion for forcing the second component of the composition into the second exit port, and an opposing rear- facing end portion attached to the stop plate, wherein the first and second plunger rods are arranged in parallel for joint movement within the first and second barrels respectively; c) a rotatable, threaded knob for connecting the plunger rod assembly to the syringe body, the threaded knob having a through-bore with a continuous internal thread for engaging the outer edges of the first and second plunger rods,