Atlas Custom Works Stainless Steel Hexagon Outer Barrel for Tokyo Marui Hi-Capa 5.1 GBB, Silver

If you're building a Hi-Capa, the outer barrel is one of the few upgrades that changes how the pistol looks without touching the internals. The Atlas Custom Works stainless hex barrel gives you a more substantial profile and a place to mount accessories, without adding the weight of a full metal slide.

The hex cutout along the barrel isn't just for looks. It reduces weight compared to a solid round tube while keeping the stainless steel construction durable. At 90 grams, it's light enough that it won't throw off your balance during draw or transition work.

The 11mm clockwise internal threading is the standard for Hi-Capa GBBs, so most compact suppressors, compensators, and tracer units will fit without adapters. You're not locked into a proprietary system.

This barrel is for the Hi-Capa 4.3 and 5.1 platforms specifically. It won't fit other GBB pistols, and it's not a drop-in for AEGs. Stainless steel resists corrosion better than plain steel, which matters if you're running the pistol in varied conditions.

What you get is just the barrel itself. Battery and charger are not included, and you'll need the proper tools to swap it out.