Overview Reviews Product Description Autotrigger Shoulder Screw for Autotrigger Kits. This is the Screw that is attached to the pump arm and is used to make the autotrigger lever move back and forth as the gun is pumped. This is for 1 Screw Product Videos Custom Field Product Reviews (No reviews yet) Write a Review Write a Review × Autotrigger pump arm Pivot / Shoulder Screw Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name *Email *Review Subject *Comments