Atlas Custom Works Aluminum Optic Mount for TM Hi-Capa 5.1 & 4.3, Silver

The Atlas Custom Works optic mount lets you run a red dot on a Tokyo Marui Hi-Capa 5.1 or 4.3 without milling the slide. If you want the speed advantage of a red dot on a competition pistol but don't want to send your slide out for machining or risk cracking it with a Dremel, this is the bolt-on solution.

What it is. A CNC aluminum adapter that bolts to the dust cover and rail area of the Hi-Capa, providing a flat, level surface for mounting a micro red dot. The mount is machined from solid aluminum rather than cast, so it holds zero and resists the recoil impulse of a gas blowback pistol. Silver finish.

Compatibility. Fits Tokyo Marui Hi-Capa 5.1 and 4.3 frames. Other brands that copy the TM Hi-Capa dimensions may work, but fit is not guaranteed. The optic itself is not included—you supply your own red dot. Most micro red dots (Holosun, Trijicon RMR pattern, Sig Romeo) mount directly; some may require an adapter plate depending on your optic's footprint.

What to expect. Installation is straightforward: the mount attaches to the frame, and you slide your optic onto the rail. You may need to adjust your slide stop or check clearance with a retracted slide, depending on your specific optic height. Once mounted, the setup is rigid enough for competition use, but always verify zero after the first few magazines.

Before you buy. This is a frame-mounted solution, not a slide-mounted one. That means your slide remains unmodified, which is good for resale and avoids the risk of cracking a thin slide. The trade-off is a slightly higher bore axis compared to a milled slide mount. If you're building a competition gun and want the lowest possible profile, a milled slide might be better. For most players who want a reliable red dot without permanent modification, this is the safer choice.

Mount only. Optic and any required adapter plates are sold separately.