This is the generation 2 shotgun with the 3 model production valve with crimp and thread. It is the latest production with the reinforced valve and body for excellent reliability and durability.  The body of the unit features a GEN2 marking, indicating that the new GEN2 activation button is included with this model. The HDS Home Defense Shotgun 16 Joules power factory production version comes with manufacture warranty. This is the ultimate personal defense launcher, the best you can get for the highest velocity with the most impact power for a .68 Cal system. The HDS Home Defense Shotgun 16 Joules is powered by 12g CO2 located in the pistol grip. It can be stored away and ready for use the moment needed. Designed with modern styling and dual Picatinny rails for mounting a grip, laser, or flashlight. This pistol features a lightweight polymer frame with internal metal parts including the trigger and hammer. Loading this gun is easy just break open the breach and drop the projectile The most reliable defense launcher in the industry shoots all types of .68 caliber projectiles: Steel Projectiles, Shaped Projectiles, Pepper Projectiles, Rubber Projectiles, Nylon Projectiles