The 
KWC Python .357 4  inch Airsoft CO2 Revolver is a full-metal, snub-nosed replica known for its heavy, realistic weight and high power output, typically exceeding 350-400 FPS
 
Core Specifications
Construction: Full metal alloy frame, cylinder, and barrel with textured polymer grips.
Power Source: Single 12g CO2 cartridge housed in the grip, accessed via an Allen key.
Muzzle Velocity: varies by source but generally reported between 350 FPS to 498 FPS with 0.20g BBs.
Weight: approximately 900g to 1100g, providing a dense, realistic feel for its compact size.
Action: Single and Double Action trigger system.
Capacity: 6-round swing-out cylinder using individual metal shells