How to Replace a Breech Seal on an FWB Model 65

The Feinwerkbau model 65, or FWB 65, is a match style competition air-pistol. These pistols are often used by air gun enthusiasts for target competition and plinking. As with all weapons, periodic maintenance and repair is required from time to time. Common problems associated with air pistols are worn piston or breech seals. Once these seals become worn, the weapon will fail to perform properly. Replacing a breech seal on your FWB model 65 can be accomplished with little difficulty.

Things You'll Need

  • Denatured alcohol
  • Air gun oil
  • Hairdryer
  • Replacement seal
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Instructions

    • 1

      Unload the weapon completely. Visually inspect the chamber to ensure that no ammunition is present.

    • 2

      Open the breech on the back of the weapon. Pull out the piston and O-ring seal.

    • 3

      Clean the piston thoroughly if dirty using denatured alcohol. Apply air gun oil to the piston.

    • 4

      Heat the new seal using a hairdryer for about 30 seconds. This will warm the seal and help with proper installation.

    • 5

      Apply a light coat of oil to the seal. Fit the seal into the breech. Replace the piston.