VFC KAC L403A1 KS-1 Gas Blowback Rifle – Tan
The Elite British Service Rifle, Reborn for the Skirmish Field.
Step up your loadout with the pinnacle of modern gas blowback performance. The VFC KAC L403A1 KS-1 GBBR is a fully licensed, meticulously engineered replica of the Knight’s Armament Company (KAC) KS-1, famously adopted by the British Army's Ranger Regiment and Royal Marines as the L403A1 Alternative Individual Weapon (AIW).
If you’re looking for unmatched milsim realism, aggressive recoil, and out-of-the-box skirmish dominance, this is the rifle to secure.
Why the VFC L403A1 Belongs in Your Armory
1. Hard-Kicking VFC V3 Gas System
At the heart of this rifle is VFC's legendary V3 Gas Blowback (EVO AR GBB) architecture. Paired with a newly designed steel bolt carrier and a high-speed steel buffer, it delivers a violent, crisp, and satisfying recoil impulse with every trigger pull while maintaining excellent gas efficiency, even in cooler UK weather.
2. Officially Licensed KAC Perfection
This is not a generic AR-15 clone. Built from CNC-machined aluminium, it features authentic, deeply engraved Knight's Armament Company trademarks and roll marks on the receiver. From the signature 12.8-inch KAC URX6 M-LOK handguard to the KAC QDC flash hider, every millimetre mirrors the real-steel weapon.
3. Revolutionary TDC Hop-Up System
Forget struggling with tiny Allen keys down the barrel. VFC has integrated their Next-Gen Top Dead Centre (TDC) Hop-Up unit. Using the included adjustment tool directly inside the chamber, you can make micro-adjustments that lock firmly in place, allowing you to easily hop heavier weight BBs (like .36g or .40g) for laser-like accuracy at range.
4. Bilateral Dominance (Fully Ambidextrous)
Engineered for dynamic movement and rapid transitions, the L403A1 features mirrored, fully ambidextrous controls. The selector, bolt release, magazine catch, and charging handle are effortlessly accessible from both sides, accommodating left-handed shooters or off-shoulder cover transitions seamlessly.
Technical Specifications
System: VFC V3 Gas Blowback (Green Gas/Propane)
Muzzle Velocity: Approx. 330-390 FPS (Gas & Temperature Dependent)
Overall Length: 790mm - 870mm (Adjustable Stock)
Weight: 2,730g (Realistic, Solid Heft)
Inner Barrel Length: 330mm
Magazine Capacity: 30 Rounds (Compatible with VFC M4 VMAG Series)
External Finish: CNC-Machined Aluminium in Flat Dark Earth (Tan)
Hop-Up: Yes, Adjustable TDC System
 
What’s in the Box?
VFC KAC L403A1 KS-1 GBBR (Tan)
30-Round Gas Magazine
VFC Hop-Up Adjustment Tool Set
BB Speedloader
User Manual