The 
G&G RK103 EVO
 is an electric airsoft rifle (AEG) known for its full metal body, version 3 gearbox, and tactical polymer handguard with rail integration system (RIS). It is an upgraded, modernized AK-47 replica featuring pneumatic blowback for a slight recoil effect. 
 
Key Features and Specifications
Construction: Features a durable full metal receiver and barrel assembly, with the stock and handguard made from high-impact nylon polymer.
Gearbox: It utilizes a full metal, fully upgradeable Version 3 gearbox.
Blowback System: Includes a pneumatic blowback system that simulates bolt movement and provides a slight recoil, adding to realism without putting extra stress on the gearbox internals.
Tactical Accessories: The polymer handguard features a Rail Integration System (RIS) for mounting various accessories like lights, lasers, and grips.
Hop-up: Equipped with an adjustable hop-up system for improved range and accuracy. 
Specification 
Details
Overall Length
985 mm
Weight
~2968g - 3200g (depending on variant)
Inner Barrel Length
463 mm
Magazine Capacity
600 rounds (high-capacity)
Fire Modes
Semi-Auto, Full-Auto, Safety
Motor
16000rpm Hi-torque Short axis
Muzzle Velocity
Typically between 330-380 FPS (with 0.20g BBs), varying by retailer/region
Battery Type
9.6v Large Type or nunchuck style recommended (not included)