Atlas Custom Works 6061 Aluminum 110mm Straight Fluted Outer Barrel for TM Hi-Capa M11 CW GBBP, Blue

The stock Hi-Capa barrel is short for a reason - it keeps the pistol compact. Atlas Custom Works' 4.3-inch outer barrel gives you a bit more presence without turning it into a carbine. At 110mm, it's roughly an inch longer than stock, which changes the silhouette and balances the slide a touch forward.

This is an outer barrel, so it does not replace the inner barrel that actually guides the BB. You get the visual extension and the weight shift, not a hop-up upgrade or a velocity boost. If you want accuracy gains, that comes from tuning the hop-up and using consistent BBs, not from a longer outer tube.

The fluting runs straight along the barrel's length. It removes a small amount of weight and gives the slide a more aggressive look. The finish is a bright blue anodize that stands out against a black frame or matches other blue-accented parts on your build.

What you need to know before buying. This fits Tokyo Marui-spec Hi-Capa frames and clones. The thread is 14mm clockwise (M11), which is standard for many GBB pistols and accepts most muzzle devices made for that pattern. The package includes two O-rings for installation - you'll need those to seal the barrel properly and prevent gas leaks from the slide.

Installation is straightforward if you're comfortable field-stripping a Hi-Capa. You do not need a gunsmith for a barrel swap, but take care with the O-ring seating. A poorly seated barrel can leak gas and make your slide short-stroke. If you are not confident, have a tech do it the first time.

Includes the O-rings needed for installation.