How to Tune a Beeman Air Rifle With a Transfer Port

Written by jeremiah blanchard
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Beeman Precision Airguns has been an industry leader in the airgun field for many years. The company produces a variety of air guns in pneumatic, spring piston and CO2-powered varieties. Tuning a Beeman air rifle is the process of dismantling, cleaning and installing precision parts to improve the accuracy and operation of the weapon. A transfer port is a part directly next to the compression chamber on a spring-piston air rifle. This piece directly affects velocity -- and if left dirty or unchecked -- can greatly affect weapon accuracy.

Skill level:

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Things you need

  • Mainspring compression tool
  • Punch and hammer'
  • Padded gun vice
  • Plastic jag
  • Cleaning patch
  • Cleaning solvent
  • New match trigger
  • New match barrel

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  1. 1

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

  2. 2

    Place the weapon in a padded gun or jaw vice. Lock the vice down tight.

  3. 3

    Disassemble the trigger assembly by punching out the two retention-pins near the trigger guard. Consult your owners manual for detailed instructions; all Beeman air rifles vary slightly with this process,

  4. 4

    Unscrew the receiver end-cap, and slowly remove the mainspring using a mainspring- compression tool. This keeps the spring under compression, relaxes it safely and keeps you safe when removing it. Take the barrel off the spring-retention tube.

  5. 5

    Visually inspect the transfer port; it is located adjacent to the compression chamber. File down any visible burring or nicks. Clean the transfer port using a plastic-cleaning jag and a small patch.

  6. 6

    File down any burring of the trigger mainspring. Discard the trigger, and replace it with a match-style, lightweight trigger. Replace the old barrel with a new, match-style barrel. Lubricate the barrel. Reassemble the weapon.

Tips and warnings

  • Never attempt maintenance on a loaded air rifle.
  • Never point an air rifle at anything that you do not intend to shoot or kill.

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