Atlas Custom Works AAP-01 Aluminum Outer Barrel Type D, Gold

Upgrading an outer barrel on a GBB pistol isn't about performance — it's about finishing the look and getting something that feels solid in the hand. The Atlas Custom Works AAP-01 Type D is machined from aluminum and weighs 60 grams, which is light enough not to throw off your balance but substantial enough to read as quality when you hold it.

What you're getting. This is Type D, one of the profile options Atlas offers for the AAP-01 platform. It's a drop-in replacement for the factory barrel, designed to mate with the existing front end without requiring internal work. The gold finish is purely cosmetic — a visual choice, not a code for length, thread type, or performance.

Before you buy. Outer barrels come in different lengths and thread configurations. Check that Type D matches the length you want for your carry setup and that it's compatible with any muzzle device or suppressor you plan to run. The package includes just the outer barrel — no mounting hardware beyond what's needed for a standard install.

Atlas Custom Works makes parts for players who want their replicas to look and feel as good as they shoot. This barrel fits that intent.