The 
Umarex Smith & Wesson 629 Classic
 with a 5-inch barrel is an officially licensed CO2-powered airsoft revolver known for its full-metal construction and realistic operation
 
Power Source: 12g CO2 capsule housed in the grip.
System: Shell-fed; BBs are loaded into the back of six brass-coloured metal shells that are inserted into the cylinder.
Firing Mode: Single and Double Action (SA/DA) trigger system.
Build: Heavyweight full-metal body (approx. 1,200g–1,700g) with a black or stainless finish and synthetic rubberised grips. 
YouTube +6
Performance Features
Sights: Features a fixed front sight with a red insert and a rear sight fully adjustable for windage and elevation.
Velocity: Standard airsoft versions typically fire at roughly 1 Joule (approx. 328 FPS/100 m/s), though some models are shipped with "power-down" shells for field legality.
Authenticity: Includes official Smith & Wesson trademarks and a unique serial number.