The Boss "X" release includes a tapered handle and a no-travel, ultra-crisp hardened stainless steel firing mechanism. It provides the most consistent trigger pressure shot after shot. Use shorter d-loops with the new small size caliper head, which includes an improved 360 degree swivel to remove torque. The Boss "X" features a smaller/quieter cocking lever, and includes separate trigger travel and sensitivity adjustments. Multi-adjustable thumb trigger positioning.