The BT-4 Combat is the choice of demanding players who are looking for a solid and cost effective bast to build up with custom parts with the ability to use military spec freatures. The combat comes with Empire reliability and Battle Tested durability. Features: Compact and durable marker ideal for stealth with Offset SlideawayTM Feedport. Tournament legal external velocity adjuster. Removabel grip frame for quick and easy upgrades. Easily accepts expansion chambers, vertical and horizontal bottle adapters. Works with CO2, N2, or Compressed air. Stainless steel bottomline. Impact resistant baked on coating. Dual Picatinny mounting rail meets Military Standard 1913. Modular trigger system. 1 year full parts and labot warranty. Light weight balanced construstion. Adjustable vertical fornt grip. Selecta-BarrelTM adapter allows use of multiple barrel threads. BT-4 Specs: Caliber - .68 Action - Semi-Auto Powered - CO2, N2, or Compressed Air Main Body Material - Aluminum Accuracy Range - 150+ ft Barrel Length - 8