The Umarex gas gun T4E HDS 68 double-barreled Home Defense Shotgun 68 combines power and speed. Thanks to its quick-piercing system it's ready to use at any time. With a light blow on the bottom of the grip you can puncture the CO2 capsule whenever the occasion demands. The HDS comes with a Picatinny rail under the barrel and a pressure. Spare parts list HDS 3.5/23/30 4.0/20 (5.971-396.0) 4 10 Housing 5 11 Housing 6 8 Device cover complete only for replaceme (4.066-426.0) 8 1 Device cover complete basalt grey RAL 70 9 11 Cover complete RM 110 (4.064-014.0) 11 30 Conversion kit holder large Kessel (2.882-692.0) 13. The T4E HDS shoots .68 caliber paintball, pepper balls, rubber balls or chalk balls out of either of two barrels or both barrels at once! Load up your 12 gram CO2, pop two projectiles into the breech, and flip.