FGC-9 Mag Catch Overview

The FGC-9 Mag Catch is a machined aluminum replacement for the 3D-printed magazine catch on your FGC-9 MKII. While the printed mag catch works fine initially, it’s one of the weakest points in the design: thin, under constant spring pressure, and prone to warping or breaking over time (especially in hot climates).

This FGC-9 Mag Catch is machined from 6061 aluminum and finished with Mil-Spec MIL-A-8625 Type II black anodize. It’s a direct drop-in replacement for the printed part. No modifications, no fitting. Remove the old one, install this one, and never worry about your mag catch failing again.

Compatible with the FGC-9 MKII.

Why Upgrade to the Aluminum FGC-9 Mag Catch

Eliminate a Known Failure Point
The printed mag catch is thin, under spring pressure, and flexes every time you insert or release a magazine. Over hundreds of cycles, the plastic fatigues. In warm environments (garages, vehicles, outdoor use), PLA and even PLA+ can deform at temperatures well below what you’d expect. The aluminum FGC-9 Mag Catch doesn’t flex, doesn’t creep, and doesn’t care about the weather.

Mil-Spec Anodized Finish
MIL-A-8625 Type II anodize isn’t marketing fluff. It’s the same specification used on military small arms components. The finish provides corrosion resistance, wear resistance, and a consistent black appearance that won’t rub off or discolor over time.

Direct Drop-In Replacement
The FGC-9 Mag Catch is machined to the exact dimensions of the original printed part. Remove your old mag catch, install this one using the existing spring and pivot pin, and you’re done. No drilling, no filing, no modifications to your lower.

6061 Aluminum Construction
6061 is the standard for machined firearm components: strong, lightweight, and corrosion-resistant. The FGC-9 Mag Catch adds minimal weight while dramatically increasing durability compared to printed alternatives.

FGC-9 Mag Catch FAQ

Is the FGC-9 Mag Catch compatible with the original FGC-9 MKI?

This FGC-9 Mag Catch is designed specifically for the FGC-9 MKII. The MKI and MKII have different lower receiver designs. Verify your build version before ordering.

What’s included with the FGC-9 Mag Catch?

The FGC-9 Mag Catch includes the machined aluminum mag catch only. You will reuse your existing mag catch spring and pivot pin from your current build.

Do I need any special tools to install the FGC-9 Mag Catch?

No special tools required. The FGC-9 Mag Catch is a direct drop-in replacement for the printed part. Remove the pivot pin, swap the mag catch, reinstall the pin. Basic punch and hammer are all you need.

Why does the printed mag catch fail?

The printed mag catch is thin and under constant spring pressure. Over time, the plastic creeps and deforms. In hot environments (100°F+), PLA-based filaments soften significantly, accelerating failure. The aluminum FGC-9 Mag Catch eliminates these issues entirely.

What is MIL-A-8625 Type II anodize?

MIL-A-8625 Type II is the military specification for sulfuric acid anodizing of aluminum. It creates a hard, corrosion-resistant oxide layer that’s more durable than paint or other coatings. The black color is dyed into the anodized layer, not applied on top, so it won’t chip or peel.

Is this a regulated firearm part?

No. The FGC-9 Mag Catch is an unregulated component. It is not a firearm, frame, receiver, or controlled part. Ships directly to your door with no FFL required.

Specifications

Material: 6061 Aluminum

Finish: MIL-A-8625 Type II Black Anodize

Compatibility: FGC-9 MKII

Installation: Direct drop-in replacement for printed mag catch

Not a Firearm: Unregulated component. No FFL required. Ships direct.