The Apex Optic Mount is a direct-fit steel mounting plate for the FNX-45 Tactical. It’s machined from a solid billet of steel and finished with a black oxide coating. This mount is built for shooters who want a secure, repeatable zero without paying extra for frills they don’t need.
What it fits:
This mount is specifically designed for the FNX-45 Tactical models that come with a factory optic cut from the factory. It is not for standard FNX-45 pistols or other models.
Compatible optics (direct mount, no adapter needed):
- Aimpoint® Acro™ P-1 & P-2
- Steiner MPS
- Lead & Steel Pandora PB-3
Key specs & fitment details:
- Material: Billet steel – no cast parts, no aluminum that can strip out over time.
- Finish: Black oxide – low glare, corrosion resistant, and matches the factory slide finish.
- Installation: Mounts directly to the factory slide cut. No filing, fitting, or extra plates required.
- Hardware included: Comes with a set of optic plate mounting screws. Thread locker is pre-applied to save you a step. If you lose the Apex screws, you can substitute the short 5-40 threaded screws that come with your FNX-45 Tac from the factory.
Important note for Steiner MPS users:
If you plan to run a Steiner MPS optic, Apex strongly recommends using their Apex Super Clamp. This clamp expands the clamping range of the MPS optic for a more secure fit. Without it, the MPS may not clamp tight enough on the mount.
Why this mount makes sense for your build:
- Steel construction means it holds zero under heavy use and won’t flex under recoil.
- Black oxide finish won’t reflect light or wear through quickly on holster draws.
- Pre-applied thread locker on the screws means one less thing to buy and one less step in your installation.
- Direct-fit design eliminates the need for shims, spacers, or gunsmith fitting.
- At $60, it’s priced for shooters who want a proven, no-nonsense plate without paying for a brand name markup.
What you get in the package:
- 1x Apex Optic Mount


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