About Real XM16E1 COLT M603

The XM16E1, or Colt Model 603, was the U.S. Army's specific variant of the early AR-15, serving as the direct predecessor to the M16A1. Its defining feature was the addition of a forward assist mechanism on the upper receiver, a requirement from the Army that distinguished it from the simpler Air Force model. Rushed into service with troops in Vietnam from 1965, the rifle gained notoriety for severe extraction failures and reliability issues in the field, largely due to fouling from its ammunition and the lack of a chrome-lined chamber. These combat failures forced critical design changes, including that chrome plating. The improved design was formally standardized as the M16A1 in 1967, making the XM16E1 the problematic yet essential bridge between the AR-15 and the iconic M16 family.

About Cybergun XM16E1 COLT M603 GBB Airsoft Rifle (CGS System)

CYMA has released this classic rifle under Cybergun?s license. Widely used by the U.S. military during the Vietnam War, it serves as a representative firearm of that era and is considered an iconic classic. Recognizing its historical uniqueness, CYMA has reproduced this replica of the XM16E1 COLT M603.
In real-steel history, this firearm has been in existence for over 60 years (as of 2026) and stands as a highly representative classic of the U.S. military, marking an important milestone in firearms history.
This Cybergun XM16E1 COLT M603 GBB Airsoft Rifle (CGS System) features a metal lower receiver engraved with highly realistic "COLT AR-15" markings, a metal upper receiver with a built-in carry handle and integrated rear sight, a 485mm metal outer barrel, and a 45mm three-prong metal muzzle brake. It is equipped with a 325mm polymer triangle handguard with a metal handguard cap, a polymer pistol grip, and a 250mm polymer fixed stock with a rubber pad. The rifle comes with a metal 20-round gas magazine and includes detailed metal components such as the trigger, trigger guard, charging handle, bolt catch, magazine release, forward assist, dust cover, front sight, and sling loop?the latter three made of steel.
Internally, this airsoft rifle utilizes the CGS system, a gas blowback platform closely modeled after the Marui MWS system. It offers comparable performance and is compatible with MWS internal upgrade parts. The rifle delivers stable operation and high accuracy, making it an excellent value-for-money choice.
This classic replica is well-suited for firearm collectors and is also fully functional for use in airsoft wargames and competitions.

Key Feature

• Semi & Fully Automatic Shooting Mode
• Metal Upper Receiver (Engraved "COLT AR-15" markings)
• Metal upper receiver with integrated carry handle and rear sight
• Metal 485mm Outer Barrel With 45mm 3 Prong Muzzle Brake
• Polymer 325mm triangle handguard with a metal cap
• Polymer pistol grip
• Polymer 250mm polymer stock With Rubber Stock Pad
• Metal Trigger & Trigger Guard
• Metal charging handle, steel sling loop, metal bolt catch, steel front sight, metal magazine release, steel dust cover, and steel forward assist
  
• Metal 20 rounds Loading Capacity Gas Magazine
• Full Steel Trigger Box
  
• With CGS gas blowback system