Before you start, decide on how much you wish to spend on the project, how you want it to look, and what parts are available. Here are some links to help you on your way...

Bryan and associates
Crooked Barn
Cooper-T
Mac1 airguns
Quackenbush airguns



Tube bulking offers an inexpensive way to bulk and lets you keep gun weight down, as well as maintain the guns original look. The number of shots you will get depends on the tube you use, as well as the tune of your gun. You will still need a tank to fill the gun. Here are some pics of different tube bulk options and portable tanks above to fill from. Right pic is the DAQ screw in bulk adapter, next is the 2240 tube. All others are painball tanks that can be used to fill your gun or directly connected to your gun.

Several of the links below sell the same style adapters that can be used with any length tube. It can be purchased in models with one or two pieces. The first group is a direct replacement for your tube cap and simply screws in. The second group is a two piece adapter. Once again the first piece replaces the tube cap. The other screws on to the front of the valve and has an o-ring to seal the tube just in front of the front most grip frame screw. Advantages of the one piece type bulk units are no permanent modifications to your gun, these normaly give more shots per fill and are a simple installation. Disadvantages, weight increase and appearance. Advantages of the two piece type, no permanent mods to your gun, light weight and little change to the appearance of your gun. Disadvantage of the two piece tube bulking is lower shot count than with an external tank. Most bulk mods can be used with air or nitrogen for cold weather shooting to a max 1500psi. Although shot count will suffer greatly.