This exciting version of the 1077 comes complete with the 88 gram AirSource kit. The 88 gram AirSource power system provides up to 400 consecutive accurate shots. The AS1077T shoots up to 625 feet per second, and has a twelve shot clip. The addition of the AirSource kit provides you with the flexibility to use Crosman Powerlets or the 88 gram AirSource. This is a great improvement to one of the best air rifles manufactured today.