Atlas Custom Works Tokyo Marui Hi-Capa 3.9 Type 2 Infinity CNC Aluminum Frame, Red

If you're building a competitive Hi-Capa or just want a lighter, cleaner-looking frame, this is Atlas Custom Works' 3.9-inch Infinity Type 2 aluminum option. It's a drop-in replacement for the factory polymer frame on Tokyo Marui Hi-Capa gas blowback pistols, machined from CNC aluminum and finished in red. At 160mm overall length, it's compact without sacrificing the standard Hi-Capa grip geometry and slide travel.

What you get. The package includes the frame itself, a stainless steel sear, valve knocker, and pin set. These internal components are the parts that actually interact with the slide and trigger mechanism, so the fit and finish here matter more than on a purely cosmetic upgrade. The sear and knocker are machined to spec for Tokyo Marui dimensions, which is why this is listed as TM-specific rather than universal across all GBB platforms.

What to expect from a metal frame. Aluminum is heavier than the stock polymer but more rigid, which can improve perceived stability during rapid fire. The trade-off is weight—your pistol will feel different in the hand, and the added mass can affect recoil impulse. The Infinity-style cutouts reduce weight compared to a solid block while maintaining structural integrity. If you're chasing the lightest possible build for competition, this isn't it. If you want durability and a custom look, it works.

Installation reality. This is a precision part that requires proper fitting. The pin holes, slide rails, and internal clearances need to align with your existing slide and internals. If you've never installed a Hi-Capa frame before, budget for a professional gunsmith or at least set aside time to work through the manual carefully.

Compatibility check. This fits Tokyo Marui Hi-Capa Series gas blowback pistols. It is not a complete gun. It will not work with AEGs, CO2 pistols, or non-TM platforms without significant modification. The red anodized finish is cosmetic and does not indicate any performance rating or FPS band.