ARES Piston for ARES Spring Power Bolt Action

ARES Piston for ARES Spring Power Bolt Action Design For Upgrade your Original Piston Elongated ventilated piston head that prevents vacuum behind the BB when you use a long barrelc Suitable For ARES M40A3, MSR338, MSR700, WA2000, L96, Gun Smiths series, M200, EDM, M40A6 Rifles