Brand : Z-Parts

Material : Precision CNC Machined Steel / Black Phosphate Finish

Compatible with : Umarex / VFC M4 / AR-15 GBB Series (KAC KS1 Style Builds)

Weight : Approx. 480g

Length : 13.7 Inch Profile

System :

This Z-Parts VFC M4 KAC KS1 13.7 Steel Outer Barrel is a high-precision, heavy-duty outer barrel upgrade engineered for Umarex / VFC M4 GBB platforms. Modeled after the modern Knight's Armament Company (KAC) KS1 profile, it is precision CNC-machined from solid steel and finished with a durable black phosphate coating for realistic weight, feel, and corrosion resistance. Built with exacting factory receiver tolerances, it eliminates inner barrel movement and barrel wobble, delivering exceptional front-end rigidity and authentic tactical aesthetics for custom KS1 rifle builds.