5KU Interchangeable Fiber Optic Sights for Marui Hi-Capa Type-2, Green/Red

Front sight upgrades on a Hi-Capa are not about adding features—they are about cleaning up your sight picture. The stock front sight is often a plain blade that blends into the target under pressure. The 5KU fiber optic sight replaces that with a colored fiber that catches ambient light and gives you a bright, high-contrast aiming point. In bright conditions, that fiber glows. In lower light, you are still working with a defined post, not a shadow.

This is a front-sight-only upgrade. It does not include a rear sight. The 5KU ships with two interchangeable fiber inserts—one green, one red—so you can swap based on lighting or preference. The aluminum body is machined to Type-2 dimensions for Marui Hi-Capa platforms, which is the dominant standard in the Hi-Capa ecosystem. If your pistol is a Tokyo Marui, King Arms, WE, or any clone built to Marui dimensions, this should fit without modification.

At 0.02 lbs, you will not feel the weight. The change is purely visual. Fiber optics do not adjust your point of impact like a rear sight would; they make the front post easier to pick up quickly, which matters in CQB and dynamic shooting where split seconds count.

Before you buy: confirm your pistol uses the Type-2 front sight mount. Most Marui-pattern Hi-Capas do, but some aftermarket or specialized builds use different dimensions. If you are unsure, check your current front sight base or consult your pistol's documentation.