Overview Reviews Product Description Empire Vent Piston Spring (#51) Vent Piston Spring for all Empire Resurrection & Sniper Inline / Vertical Regulators. Product Videos Product Reviews (No reviews yet) Write a Review Write a Review × Empire Vent Piston Spring Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name *Email *Review Subject *Comments