The TechT G3 Bolt Engine totally reconfigures the Stock G3's method of operation. By doing so we were able to improve performance on every level. Lower operating pressure, shorter dwells, better consistency, etc... The new TechT G3 Bolt Engine comes with a lifetime warranty, and It is constructed of highgrade aircraft aluminum and goes through our licensed annodizing method to make them both durable and great looking. The TechT G3 Engine includes a completely new "tool-less" backcap, as well a jewel decal to let everyone know to stay out of your way. Only 7.9 grams.