Atlas Custom Works Hammer Spring Housing for Hi-CAPA, Silver

The hammer spring housing is the part most Hi-CAPA builders reach for first when they want to change the feel of their trigger. Atlas Custom Works machined this Silver-finish one from aluminum to cut weight without sacrificing the stiffness the hammer needs for reliable strike.

What it does. Inside a gas blowback pistol, the hammer spring housing sits between the hammer and the frame, controlling how the spring loads and releases. A stiffer housing gives a cleaner break and more consistent hammer fall; a lighter one reduces moving mass and can help with follow-up shot speed. This is the kind of tweak that matters in competition stages where you're running multiple shots in quick succession.

Material and fit. Machined from aluminum, this housing weighs 0.3 lbs and resists the wear that can creep into polymer or lower-grade metal parts over hundreds of rounds. It's built for the Hi-CAPA platform, which is the dominant choice for competitive airsoft in the US and Japan. If you're already running a Hi-CAPA, you know the ecosystem — parts, magazines, and upgrades are everywhere.

Before you buy. This is a mechanical part, so there's no battery or charger to worry about. You'll need basic gunsmithing tools to swap it out, and if you're pairing it with other internal upgrades (sear, hammer, guide rod), make sure the whole package is tuned together. A single upgraded part won't fix a mismatched system.

Includes 30-day return and warranty coverage.