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

The Hi-Capa platform dominates competition airsoft for one reason: it accepts serious customization without breaking the bank. The Atlas Custom Works 3.9 Type 4 frame is where that customization starts — a direct replacement for your Tokyo Marui Hi-Capa's stock polymer frame, machined from CNC aluminum instead.

What changes when you swap it. The aluminum construction adds rigidity to the slide rail and grip section, which reduces flex during rapid follow-up shots. That matters most in competition stages where you're drawing, firing multiple targets, and transitioning under time pressure. At 160mm, the frame keeps the pistol compact enough for practical carry while maintaining enough slide travel for reliable cycling.

Type 4 and no marking. This frame follows the Type 4 profile and is sold without additional markings laser-etched into the surface.

What's included. You get the frame itself, a stainless steel sear, valve knocker, and pin set. These internals are the parts that interface directly with the slide and trigger mechanism, so quality here affects trigger feel and lockup consistency. The frame is sized for Tokyo Marui Hi-Capa Series pistols specifically.

Before you buy. This is a frame-only upgrade. You'll need to transfer your existing slide, barrel, hop-up unit, and trigger group from your stock Hi-Capa, or source them separately. Installation requires disassembling the pistol completely and pressing out old pins — if you've never done this, budget for a technician or set aside time to watch a teardown video first. The aluminum frame is heavier than polymer, which shifts the balance point forward; some shooters prefer this for recoil control, others find it affects their draw speed.

Available in Black. Matches the ACW-GB-564-BK SKU.