CTM CNC UnderMount Picatinny Stock Adapter for Hi-CAPA Pistols, Electroplated Rainbow

A Hi-CAPA is a competition pistol, which means it's compact and fast. But sometimes you want a stock for stability during rapid fire or when you're running carbine drills. The CTM CNC UnderMount solves that by adding a Picatinny rail under the frame, giving you a mounting point for a rear stock system.

How it mounts. The adapter bolts to the Hi-CAPA frame and sits low enough that it doesn't interfere with most frame modifications. It's machined from 6061 aluminum with an electroplated rainbow finish, so it's light but holds up to the recoil of a gas blowback. The rail surface is standard Weaver/Picatinny, which means most aftermarket stock systems for Hi-CAPA will attach without needing special hardware.

What it's for. This is a speedQB and speedsoft accessory. The stock gives you a more natural cheek weld and better control during follow-up shots, but the adapter itself is lightweight so you don't lose the maneuverability that makes a pistol useful in tight spaces. It's not a full carbine conversion—just the interface that lets you add one.

What you need to know. The adapter is designed for Tokyo Marui Hi-CAPA platforms specifically. You'll need to source a compatible stock system separately; this is just the mounting hardware. Battery and charger are not included.