Keep opponents in Awe. With Scenario players in mind the BT-4 Assault is the choice of demanding players who look for military spec features and feel coupled battle tested BT reliability and battle tested durability. If you are looking to put some fear into your tournament opponents turn up with this mean rig. Features: Standard with collapsible car stock, M4 style barrel and M4 style rearsight. Offset Slideaway Feedport. Tournament legal external velocity adjuster. Removable grip frame for quick and easy upgrades. Easily accepts expansion chambers, vertical and horizontal bottle adapters. Works with CO2 or Compressed air. M-4 style raised rearsight/carrying handle. Tactical collapsible car stock. M-4 style barrel system. Stainless steel bottomline. Impact resistant baked on coating. Dual Picatinny mounting rails meet Military Standard 1913. Modular trigger system. 1 year full parts and labor warranty. Slide-AwayTM Feedport for easy cleaning, maintenance - Offset for aim and accuracy. Light weight balanced construction. Adjustable vertical front grip. Selecta-BarrelTM adapter allows use of multiple barrel threads. Specs: Caliber: .68 Action: Semi-Automatic Powered: CO2 or Compressed Air(HP Output) Cycle Rate: 13BPS Main Body Material: Aluminium Accuracy Range: 150+ft