Atlas Custom Works Tokyo Marui Hi Capa GBB 3.9 Type 3 No Marking Aluminum Frame, Gold

The Atlas Custom Works 3.9 Type 3 frame is a drop-in replacement for Tokyo Marui Hi-Capa gas blowback pistols. At 160mm, it's shorter than a standard Hi-Capa frame, which shifts the balance point forward and reduces overall length. This matters for competitive shooters who want a more compact pistol for 3-gun or IPSC stages where draw speed and maneuverability count.

What makes this frame different. The Type 3 designation refers to the frame profile and slide stop geometry — it's designed to work with standard Hi-Capa slides and internals while offering a slimmer grip circumference. The "No Marking" version has no serial number or manufacturer stamps on the frame, which some buyers prefer for compliance reasons or a cleaner aesthetic. Everything is CNC-machined from aluminum, so you get the rigidity of metal without the weight penalty of steel. The gold finish is cosmetic only.

What's included. You get the frame itself, a stainless steel sear, valve knocker, and the pin set needed for installation. This is a parts-level upgrade, not a complete pistol. You'll need to source your own slide, barrel, hop-up unit, and magazine to build a functioning gun, or swap this frame into an existing Hi-Capa if you're refreshing an old build.

Before you buy. Frame swaps on Hi-Capas require careful fitting. The sear and valve knocker must align precisely with your slide's internals, and pin holes don't always line up perfectly between manufacturers. If you're not comfortable gunsmithing, budget for a professional installation. This isn't a beginner upgrade — it's for builders who know what they're assembling.