Maple Leaf 6.02mm 138mm Nickel-Plated Brass Inner Barrel for G17/18, Desert Warrior, Hi-Capa 4.3, P226, Silver

Upgrading the inner barrel is one of the most effective first modifications for a GBB pistol. Stock barrels are often basic tubes with inconsistent bore dimensions. A precision-machined barrel improves air seal and shot-to-shot consistency, which translates directly to tighter groupings at distance.

The Maple Leaf 6.02mm barrel is machined from brass with a nickel plating finish. The 6.02mm bore is tighter than the standard 6.03mm, which reduces the gap between the BB and barrel wall. That tighter fit keeps the BB more stable as it travels down the barrel, improving accuracy without requiring other modifications.

This 138mm length fits GBB pistol platforms including G17/18, Desert Warrior, Hi Capa 4.3, and P226 replicas. It drops into the slide assembly where the factory barrel sits, though you should verify fit with your specific frame and slide combination.

Installation requires removing the slide from the frame and swapping the barrel. If you are new to GBB maintenance, take note of how the existing barrel sits before you begin. The nickel plating resists corrosion and makes cleaning easier than bare brass.

This is an upgrade component, not a complete gun. You will need a compatible GBB pistol frame and slide to use it. Battery and charger are not involved—this is a mechanical part for gas blowback pistols only.