Kaw Valley Precision Gen 2 1/2x28 Suppressor Piston KVP Suppressor Pistons are in the pattern known as BPISTIN, an acronym which stands for: Booster Piston, Industry Standard Ten Index Notch Suppressors that can utilize the KVP Gen 2 Piston: Dead Air Odessa Griffin Revolution: Resistance, Optimus 9, and Bushwacker Silencer Co: Hybrid, Octane, Omega K, Omega 36M YHM: Booster Assembly ECCO Machine Phoenix Pistol Cans and Booster Assemblies