When sourcing airsoft guns, the price is heavily influenced by the internal gearbox quality (Version 2 or 3), the motor type (High-torque vs. Standard), and the barrel precision (6.01mm to 6.05mm). For B2B buyers, it is essential to verify the FPS (Feet Per Second) consistency and the Joules rating to ensure they meet the specific legal limits of the destination country. High-end models should feature Full Metal construction or Reinforced Nylon Fiber, while entry-level models typically use ABS plastic.