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The ProMag FNHA8 extends your FNX-45 firepower with a straightforward 20-round capacity that doubles down on what already makes the gun appealing for range work and training. This isn't just a mag that holds more rounds—it's built to feed them consistently.
The double-stack design gives you significant magazine real estate without turning the gun into something unwieldy. The blued steel body handles the abuse of repeated loading cycles at the range, and the heat-treated finish resists corrosion from sweat and the elements. A lot of people run these at competitions or during high-round-count training days when they want to limit mag changes.
ProMag equipped this magazine with a chrome-silicon wire spring that's precision-wound to deliver smooth feeding from full capacity down to the last round. The injection-molded follower keeps rounds aligned through the feed cycle, and the design has been proven across thousands of units. The removable floorplate makes cleaning straightforward when you need to keep things fresh.
Made in the USA and backed by a lifetime manufacturer's guarantee, the FNHA8 works as a spare for FNX-45 owners or as your primary loader for extended sessions. The round baseplate design pairs well with the gun's geometry and sits flat in a standard mag carrier if you're running duty-style training.
Yes, this magazine is specifically engineered for the FN FNX-45 in .45 ACP. It uses the standard FNX-45 magwell interface. If you're running an FNX-9 or FNX-40, this will not be compatible—each FN platform uses its own magazine geometry.
The magazine is designed for 20 rounds, though some users report it may consistently load 19 rounds depending on ammunition dimensions and personal loading technique. The double-stack design is engineered to handle full capacity, and the chrome-silicon spring supports the weight throughout the magazine's lifespan.
The factory FNX-45 comes with 10 or 15-round magazines. The ProMag extends that to 20 rounds, which means fewer mag changes during range sessions. The tradeoff is that the magazine sits lower in the gun due to the extra rounds, which some competitors prefer for faster reloads. Performance-wise, the chrome-silicon spring is designed for reliable feeding across the full capacity.
ProMag backs all their magazines with a lifetime manufacturer's warranty against defects. If you experience a spring fracture or follower failure, ProMag will replace it. Warranty claims do require contacting the company directly and may involve shipping the magazine for inspection.
| UPC | 708279014970 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | FNH-A8 |
| Brand Fit | FN |
| Caliber/Gauge | .45 ACP |
| Capacity | 20 |
| Color | Black |
| Model | |
| Model Fit | FNX |
| Product Type | Magazine |
| Shipping Weight | 0.35 |
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