ASG's Dan Wesson 6" full metal CO2 revolver is a heavy weight pistol. The grip has an ergonomic shape making it a comfortable pistol to shoot. This grip can be hinged off the pistol with no tools, revealing the CO2 cartridge compartment. Undo the cartridge screw, insert a 12g co2 cartridge and tighten the screw. The revolver ships with six full-sized metal shells which are completely removable. Each shell holds a single BB. The revolver also includes a 20mm rail which can be attached to the top of the pistol, as well as a six shot speed loader for the shells. A note on power: These "1 joule" versions of the Dan Wessons have factory-modified shells to reduce their power output. As a result, the pistols produce a relatively low 200-240fps giving comparatively poorer range than more powerful semi-automatics. The restrictor in the shells can be modified to increase the power closer to one joule, however power becomes inconsistent and we could not guarantee sub 1 joule power output. Altering shells or using more powerful shells is done entirely at your own risk and is not recommended from a legal standpoint. We view these pistols in their "1 joule" form as more for collectors and plinkers than for proper long range skirmishing.