The Bluetick Tube is a shroud-length, high-pressure reservoir for the Benjamin Bulldog that not only gives you the benefit of increased air volume, but also allows you to install an after-market cylindrical moderator. The Bluetick Tube would also be a good choice when you'd like to add a HUMA Regulator to your build and keep the stock length.

Bluetick Tubes include a custom machined billet aluminum end cap which maximizes internal air volume. (you would need to add an AirBow Endcap and fill probe when installing a HUMA regulator, each sold seperately) 
 
Bluetick Tubes are made from Certified 2024 Aluminum with a .125" wall thickness. This is much stronger than the material used in the factory reservoirs.