The FN 20-100720 is the standard factory-issue 15-round magazine for the FN 545 Tactical chambered in .45 ACP.
Unlike the 18-round extended versions that often ship with the firearm, this 15-round unit features a black polymer baseplate that sits closer to the grip, offering a more streamlined profile for those who find the 18-rounder a bit too "tall" for comfortable carry or storage.
Technical Specifications
| Feature | Details |
| Manufacturer | FN America |
| Part Number | 20-100720 / FN20-100720 |
| Caliber | .45 ACP |
| Capacity | 15 Rounds |
| Body Material | Polished Nickel-Coated Steel |
| Base Plate | Black Polymer (Mid-Length) |
| Follower | High-Visibility/Low-Friction Polymer |
Key Highlights
- High-Quality Finish: The nickel coating isn't just for aesthetics; it provides superior corrosion resistance and ensures a "slick" drop-free reload, even when the magazine is dirty.
- Witness Holes: Features numbered witness holes on the rear of the magazine body so you can verify your round count at a glance (1 through 15).
- Reliability: Since this is an OEM (Original Equipment Manufacturer) part, it uses the exact spring tension and follower geometry required for 100% reliability in the FN 545 striker-fired system.
Fitment Note
This magazine is designed specifically for the FN 545. While the .45 ACP magazine bodies for the FNX-45 (hammer-fired) look nearly identical, the baseplates are different. If you try to use this in an FNX-45, it may not seat properly without swapping the baseplate to an FNX-specific version.
