The Apex Tactical Specialties FNX 45ACP magazine extension is a straightforward upgrade for shooters running FNX-45 pistols who want more rounds on tap without swapping to a different platform. This base pad extension adds two rounds to your standard FNX magazine, giving you the extra capacity advantage in competition, duty, or serious carry scenarios. Because Apex engineered it carefully—leaving just enough room to load the added rounds while still allowing the spring to compress enough that a fully loaded extended magazine seats smoothly with the slide in battery—you get genuine usable capacity, not a gimmick.

Installation is refreshingly simple: a single set screw holds the extension in place and lets you remove it just as easily if you need to swap back to standard mags. The aluminum construction gets a Black Type III Hardcoat Anodize finish, so it'll handle holster wear and the occasional fumble without showing its age. Grip matters, and Apex thought about that too—finger grooves around the perimeter and across the front corners give you a solid purchase when you're reloading under stress or just running mags at the range.

One detail worth noting: the extension preserves slide lock function, so your pistol will still lock back on the last round. That means you won't lose that tactile/visual cue that tells you you're dry—critical for training and real-world reliability. If you run FNX-45s hard, this is the kind of no-nonsense mod that earns its place on your gun.

Key Features

• Adds two rounds to standard FNX-45 magazine capacity
• Machined aluminum construction with Black Type III Hardcoat Anodize for durability
• Designed for reliable feeding and full magazine seating with slide in battery
• Maintains slide lock function after final round
• Textured grip surfaces (perimeter and front corner grooves) for positive purchase during reloads
• Single set screw installation and removal

Specifications

Brand	Apex Tactical Specialties
Firearm	FNX-45 pistol
Caliber	45 ACP
Capacity Increase	+2 rounds
Material	Aluminum with Black Type III Hardcoat Anodize
Installation	Single set screw

Frequently Asked Questions

Will this extension work with my FNX-45 standard magazines?

Yes, the Apex Tactical magazine extension is designed to fit FNX-45 model pistols and works with the standard magazines for that platform.

Does the magazine still lock the slide back when empty?

Yes. Apex engineered the extension to maintain slide lock function after the last round is fired, so you'll retain that critical empty-magazine indicator.

How is it attached to the magazine?

A single set screw secures the extension to the magazine base pad. The same screw allows you to remove it quickly if needed, making it easy to swap between extended and standard capacity mags.

Will a fully loaded extended magazine seat reliably in the pistol?

Yes. Apex designed the extension to leave enough space for the magazine spring to compress fully, allowing a fully loaded extended magazine to seat smoothly with the slide in battery.