VFC KAC L403A1 KS-1 GBBR Airsoft

VFC KAC L403A1 KS-1 GBBR Airsoft Rifle – Licensed Knights Armament Replica

Next-Generation Military Realism in a Premium Gas Blowback Platform

The VFC KAC L403A1 KS-1 Gas Blowback Airsoft Rifle is one of the most advanced and highly anticipated AR-platform releases in modern airsoft. Developed through a collaboration between VFC (Vega Force Company) and Knights Armament Company (KAC), this rifle represents the latest evolution of the legendary SR-16 lineage and the first entry in the Knights Stoner (KS) Carbine series.

Adopted by the British Military under the Project Hunter / Future Commando Force program, the real steel L403A1—also known as the KS-1—serves as the Alternate Individual Weapon (AIW) for elite units such as the Royal Marines and UK Ranger Regiment. This airsoft replica faithfully recreates that cutting-edge service rifle in both form and function, making it a top-tier choice for collectors, MilSim players, and serious enthusiasts.

Fully Licensed Knights Armament Authenticity

VFC delivers an exceptional level of detail with fully licensed KAC trademarks and engravings, ensuring complete authenticity across the platform.

The rifle is built with a precision CNC-machined aluminum receiver set, providing a realistic weight, strength, and finish. Key external features include:

• 12.8″ KAC URX 6 M-LOK handguard
• Monolithic-style Picatinny top rail
• 13.7″ dimpled heavy-profile barrel
• KAC QDC flash hider (suppressor compatible)
• KAC folding front and rear sights
• B5-style adjustable crane stock with QD sling points

Every detail mirrors the real L403A1 used in active military service.

Fully Ambidextrous Modern AR Platform

Designed for modern combat standards, the KS-1 features a fully ambidextrous lower receiver, making it one of the most operator-friendly AR-style GBBRs available.

All major controls are mirrored:

• Fire selector
• Magazine release
• Bolt catch / release
• Charging handle

This ensures seamless usability for both left- and right-handed players, reflecting real-world military adoption of ambidextrous systems.

Upgraded VFC V3 Gas Blowback System

At the core of the KS-1 is VFC’s refined V3 GBBR system, engineered for durability, recoil realism, and consistent field performance.

Internal upgrades include:

• Steel hammer set and firing pin for long-term reliability
• Reinforced fire control components
• Precision-machined steel bolt carrier
• Heavy recoil buffer system for realistic kick
• Crisp semi, full-auto, and safe fire modes

The result is a satisfying, hard-kicking gas blowback experience with excellent mechanical feedback.

Next-Generation Hop-Up System

The KS-1 introduces VFC’s TDC-style AR hop-up system, designed for precision and field efficiency.

Key advantages include:

• Steel-reinforced hop unit
• External adjustment capability (no full disassembly required)
• Tool-based fine tuning with VFC adjustment tool (sold separately)
• Improved consistency and long-range accuracy

This allows players to quickly adapt to field conditions without downtime.

Included with the Rifle

• VFC KAC L403A1 KS-1 GBBR (Tan)
• VFC 30-round VMAG V3 GBB magazine
• User manual

The included VMAG offers excellent gas efficiency and supports selectable dry-fire mode and last-round bolt lock functionality.

Why Choose the VFC KAC L403A1 KS-1?

The KS-1 stands at the top tier of modern gas blowback rifles. It combines real-world military design, full KAC licensing, advanced ambidextrous ergonomics, and upgraded VFC V3 internals into one highly realistic platform.

Whether you’re building a British forces impression kit, upgrading to a serious GBBR platform, or collecting modern AR evolutions, the KS-1 delivers unmatched authenticity and performance.

Key Features

• Fully licensed Knights Armament design
• CNC-machined aluminum receiver set
• URX 6 M-LOK handguard system
• Monolithic Picatinny upper rail
• Fully ambidextrous controls
• VFC V3 gas blowback system
• Steel internal reinforcement parts
• Realistic recoil and bolt action feel
• TDC-style adjustable hop-up system
• Folding adjustable B5-style stock
• KAC QDC flash hider compatibility