5KU Hi-Capa Metal 20mm Picatinny Rail Mount, Red

If your Hi-Capa is running iron sights only, you're leaving optics on the table. The 5KU 20mm Picatinny rail mount adds a standard attachment platform to the dust cover of your Marui Hi-Capa, so you can run red dots, magnified optics, or even a laser without drilling the frame or hunting for proprietary solutions.

How it fits. This is a direct-mount design for Marui Hi-Capa pistols. It attaches to the dust cover area where most Hi-Capa rail systems interface, using the existing mounting points rather than requiring frame modification. Once installed, you have a full 20mm Picatinny section to work with—enough space for a compact red dot, a backup iron sight set, or a weaponlight depending on your build.

What you get. The rail is machined from aluminum, which gives you rigidity without the weight penalty of a full steel block. The red anodized finish matches other 5KU accessories if you're building a coordinated look. It ships with the mount itself.

Before you buy. This adds height and forward weight to your pistol. It won't change the gun's function, but it will change the balance, and you may need to adjust your draw or presentation to clear the added profile. Also verify your optic's footprint—some micro red dots sit higher than others, and you might need a co-witness mount or riser depending on your sight height preference.