Dramatically improve the shot count and balance of your HW100 by fitting a Luxfer 400 / 500cc buddy bottle.
Comes supplied with a quick-fill valve and pressure gauge.
Fits the action in minutes using only a hex key.
Will fit standard stock with a modification picture included.
 
If fitting a 400 / 500 cc   carbon fiber bottle with the 18 * 1.5 mm thread, you may require 2.65 mm section O-rings; please state when ordering.
THE MAXIMUM WORKING PRESSURE MUST NOT EXCEED  200 BAR !