Laser Ammo SureStrike PST Back Cap Stainless. E.A.L. pistol conversion kit (with red & blue barrel) OR our firing pin activated FLASH adapter. This modification has been done to prevent a laser misfire due to vibrations and to allow for longer battery life for your dry fire training. The back cap for the R.E.A.L. pistol conversion kit activates the SureStrike REAL laser cartridge and is used in recoil enabled pistols. The back cap for the FLASH activates the SureStrike laser cartridge and is used in recoil enabled rifles. If you have a REAL pistol conversion kit or Glock/Sig recoil gun with a blue & red barrel this back cap is for you. As of now CZ 1911 and 2011 are still using the Gen 1 vibration back cap. Newer Flash kits that have a spring and firing pin included will need this PST back cap since it is firing pin activated not vibration activated. Compatible with both Red & IR REAL vibration activated laser cartridges. This back cap is to replace the back cap on red/blue REAL cartridge (with REAL barrel conversions) and is for use in recoil guns only. If you have a CZ 1911 or 2011 please be sure to use the vibration back cap replacement. Specifications for Laser Ammo SureStrike PST Back Cap: Manufacturer: Laser Ammo Fabric/Material: Stainless Steel Gun Type: Airgun Color: Stainless Package Contents: Laser Ammo SureStrike PST Back Cap Laser Ammo 9MPSC: SureStrike PST Back Cap Stainless