The Blichmann Beer Gun is the easiest way to fill beer bottles. The most common use for a Beer Gun is to move previously kegged and carbonated beer into bottles. It can also be used to move beer from a fermenter to the bottle, provided the fermenter pressure can be raised slightly with CO2.

Since many people have draft system parts laying around the house, the various parts are sold separately. Everything on this page is required, so if you don't have it, you will need to purchase it.
What you need to use the beer gun:

CO2 Source: You will need a CO2 Cylinder with a regulator. The regulator has to be split to provide 2 CO2 sources, as shown below. You can use the same system that you use with your draft system providing you modify it for dual outputs as shown below.

Beer Gun Accessory: This optional accessory kit provides everything you need to get your BeerGun up and running! A liquid ball-lock disconnect, a 5ft length of hose for your CO2 line with 1/4" stainless flare connectors on each end, one stainless 1/4" disconnect and stainless clamp (for the 10ft beer hose that comes with the BeerGun), and a brass 1/4" NPT X 1/4" flare adapter for connecting to the CO2 valve on the BeerGun. Requires a spare CO2 port and shutoff valve on your regulator.

CO2 Splitter: You will need to add an additional CO2 output to your existing regulator. That will require a "Y" fitting and a shutoff valve as shown. These are very easy to install. Just remove your regulator from the tank and unscrew the shutoff valve. Screw the shutoff valve into the "Y" adapter, and add the additional shutoff valve that you purchased. Then screw the assembly into the regulator. You should use teflon tape on all of the joints. Teflon tape is available at all hardware stores.