Sniper Rifle Parts & Accessories TTI-S0001VSR10 VSS-Zero Trigger TTI-S0002VSR10 one piece 7mm spring guide for 11mm outer diameter spring TTI-S0003VSR10 one piece 9mm spring guide for 13mm outer diameter spring TTI-S0004VSR10 45 degree Piston TTI-S0005VSR10 90 degree Piston TTI-S0006VSR10 TDC CNC Hop Up Set (One piece CNC hop up chamber+TDC adjusting kit)