• Dramatically improve the shot count and balance of your HW100 by fitting a 400 / 500cc buddy bottle.
  • Comes supplied with quick fill valve and pressure gauge.
  • Fits to the action in minutes using only a hex key.
  • Will fit standard stock with modification picture included.


  • The 400 / 500cc will fit carbon fibre bottles with the 18*1.5mm thread.

Weihrauch HW 100 Buddy Bottle Conversion