Airsoft Masterpiece Fix 137mm CNC Aluminum Threaded Outer Barrel for Hi-Capa 5.1 GBB Pistols, Silver

If you're running a Tokyo Marui Hi-Capa 5.1 and want a threaded outer barrel that actually looks the part, this is the straightforward upgrade. Airsoft Masterpiece's fix outer barrel gives you a clean, machined finish in CNC aluminum, plus threading at the muzzle so you can mount a suppressor, compensator, or flash hider without hunting for adapters.

What you're getting. The barrel itself is 137mm long and weighs 125 grams. It's machined from CNC aluminum alloy, which is the standard for durability and a solid feel. Silver finish matches the typical Hi-Capa slide colourway. The package includes the outer barrel and a thread cover, so you can leave the threads protected when you're not running a muzzle device.

Compatibility. This fits Tokyo Marui 5.1 Hi-Capa and other similar GBB pistols. That's the main compatibility you need to check — if your gun is a Hi-Capa clone or aftermarket variant, measure your current outer barrel length and compare it to the 137mm here. A mismatch won't break anything, but it can throw off your sight alignment or make accessories sit weirdly.

What this does and doesn't do. An outer barrel is purely an external upgrade. It doesn't change your inner barrel, hop-up, or velocity. If you're chasing accuracy or range, that work happens with the inner barrel and hop-up chamber. This is for aesthetics, accessory mounting, and giving your pistol a more finished look. The threading accepts standard airsoft muzzle devices.

Before you buy, confirm your current outer barrel length and whether your slide clearance will accommodate a slightly different profile. Some Hi-Capa variants have tighter tolerances than others. Includes thread cover for when you're not running a muzzle device.