Get more rounds in your FNX 45 without swapping out the whole magazine. This base pad extension adds two and a half (2.5) rounds of capacity to your standard factory magazine. That extra half-round means you can seat a fully loaded magazine with the slide in battery—the spring compresses just enough to make it work. No forcing, no fighting it.
Built from machined aluminum, this extension comes in two finishes: Black Type III Hardcoat Anodized or Flat Dark Earth Cerakote (matches the factory FDE frame color closely). The black version has machined notches on the bottom face so you can color-code your mags for quick identification and tracking. The FDE uses a standard Cerakote color that’s commercially available—no special blends, just a solid match.
Key specs and fitment:
- Capacity increase: Adds 2.5 rounds to standard FNX 45 magazines
- Slide lock function: Maintains last-round slide lockback—the included extra-power magazine spring helps ensure it works every time
- Mag changes: Finger grooves on the perimeter and front corner give you a solid grip for ripping a stuck mag out fast
- Installation: Single set screw keeps the extension snug and makes disassembly easy—no special tools needed
- Materials: Machined aluminum with durable Type III Hardcoat anodize (black) or Cerakote (FDE)
- Compatibility: Fits FNX 45 standard-capacity magazines only
Why the 2.5 rounds? The design adds space for two extra rounds plus enough spring compression to let you insert a fully loaded magazine when the slide is forward. That half-round capacity is the difference between a magazine that seats and one that doesn’t.
Important note: This product cannot be shipped to California, Oregon, Rhode Island, or Washington. Check your local laws before ordering.
At $50, this is a straight-up capacity increase for your FNX 45. No gimmicks, no overpriced branding. Machined metal, reliable spring, easy install. If you’re running FNX 45 mags and want more rounds without buying new ones, this is the move.
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