Atlas Custom Works Tokyo Marui Hi-Capa GBB 3.9" Type 4 No Marking CNC Aluminum Frame, Silver

The 3.9-inch Hi-Capa frame is for players who need a competition-legal pistol that still fits a full grip. Standard Hi-Capa frames run longer; this one shortens the chassis to 160mm while keeping the slide travel and trigger geometry intact. If your field or match has overall-length restrictions but you still want a single-stack 5-inch slide platform, this is the workaround.

What makes it different. The Type 4 No Marking design omits manufacturer stamps and serial markings on the frame surface. That matters for certain competitive divisions and for players who prefer a clean, unbranded look. The SV style adds a distinct slide cut profile that pairs with the shortened frame for a compact, purpose-built appearance.

Build and fit. Machined from CNC aluminum, the frame replaces the factory polymer or cast alloy original on Tokyo Marui Hi-Capa pistols. It comes with a stainless steel sear, valve knocker, and pin set—everything needed to assemble the slide group to the frame. The fit is tight by design; a proper gunsmith should handle the installation to ensure correct sear engagement and trigger timing.

What you're not getting. This is a frame only. The slide, barrel, hop-up unit, magazine, and gas system are not included. You're building around an existing Hi-Capa upper or sourcing those parts separately. If you're new to Hi-Capa building, start with a complete pistol and swap the frame later rather than hunting for individual components.

Before you buy. Atlas Custom Works frames are not drop-in for every Marui Hi-Capa variant. Verify your slide group compatibility before ordering—especially if you're running a aftermarket barrel or a different hop-up assembly. The 160mm length is shorter than a standard 5-inch frame but longer than a compact 4-inch variant, so measure your current setup if you're chasing a specific overall dimension.

Includes all necessary pins and internal components for assembly. Professional installation recommended.