FN 545 Tactical 4.71in .45 ACP Threaded Optic-Cut
Pros & cons
What works
- Factory optic-cut slide saves $200-$400 vs. aftermarket milling
- 31 oz weight manages .45 ACP recoil better than polymer competitors
- Suppressor-height night sights co-witness with MRDs out of the box
- Ambidextrous controls suit left- and right-handed shooters equally
Trade-offs
- No thread protector included—add $30-$50 for muzzle device
- 8.30-inch length prohibits comfortable concealed carry
- .45 ACP ammunition costs $0.50-$0.70 per round vs. 9mm
Video review
Expert review
Specs at a glance
About this product
The FN 545 Tactical 4.71in .45 ACP Threaded Optic-Cut is a full-size service pistol built for suppressor and optic integration with MIL-STD-1913 rail and ambidextrous controls. It ships with suppressor-height night sights for immediate co-witnessing and weighs 31 oz with an 8.30-inch overall length.
What is the FN 545 Tactical used for?
The FN 545 Tactical is engineered for duty, range, and Title II applications requiring suppressor and optic readiness. Its 4.71-inch threaded barrel accommodates .578x28 muzzle devices, while the optic-cut slide accepts most MRD patterns. The 31 oz weight and polymer frame balance recoil management with all-day carry comfort.
How does the FN 545 Tactical compare to the Glock 21 Gen4?
The FN 545 Tactical outperforms the Glock 21 Gen4 in optic and suppressor integration with a factory-cut slide and threaded barrel. While both use polymer frames and .45 ACP caliber, the FN ships with suppressor-height night sights and ambidextrous controls, whereas the Glock requires aftermarket milling. The FN’s 8.30-inch length is 0.5 inches longer than the Glock’s 7.8-inch profile.
What does it weigh and what are the dimensions?
The FN 545 Tactical weighs 31 oz with an overall length of 8.30 inches and a 4.71-inch barrel. The slide width measures 1.25 inches, and the grip circumference adjusts from 5.5 to 6.0 inches with interchangeable backstraps. This places it firmly in full-size duty pistol territory, comparable to the Stevens 334 Rifle in heft but optimized for handgun applications.
Who is this NOT for?
The FN 545 Tactical is not for concealed carry or shooters seeking a compact platform. Its 8.30-inch length and 31 oz weight exceed typical CCW dimensions, and the .45 ACP caliber produces significant recoil compared to 9mm alternatives. Beginners or those avoiding NFA-regulated accessories should consider a standard model without threading.
What's in the box?
The FN 545 Tactical includes one pistol, two 15-round magazines, three interchangeable backstraps, and a cable lock. The night sights are pre-zeroed at 25 yards, and the optic-cut slide comes with protective plates. No thread protector is included—plan on a $30-$50 muzzle device or suppressor mount.
Is the FN 545 Tactical worth it at $1002.99?
At $1002.99, the FN 545 Tactical justifies its price for shooters needing out-of-the-box suppressor and optic readiness. Compared to aftermarket milling costs of $200-$400, the factory-cut slide and threaded barrel save time and ensure warranty compliance. For those focused on hunting or long-range precision, the Stevens 334 .243 Win offers better value per dollar for rifle applications.
Key attributes
| upc | 845737015671 |
| manufacturer | FN America / FN Herstal |
| manufacturer part number | 66-101385 |
| action | Double Action Only |
| atf type | Pistol |
| barrel finish | Black |
| barrel length | 4.71" |
| caliber/gauge | .45 ACP |
| capacity | 10 + 1 |
| number of magazines | 2 10 rd. |
| package height | 3.3 |
| package width | 11.13 |
| product type | Semi-Auto Pistol |
| safety | No |
| shipping weight | 4.05 |
| sights | Suppressor Height Night Sights |
| sights type | Dovetail |
| slide description | Optic Cut/Serrated |
| thread pattern | .578″x28 |
| units per box | 1 |
Frequently asked questions
- Is it compatible with SilencerCo Octane 45 suppressors?
- Yes, the .578x28 threaded barrel directly accepts SilencerCo Octane 45 suppressors without adapters. Ensure the piston assembly matches the thread pitch, and expect a 4-6 dB reduction at the muzzle. Always verify NFA compliance before mounting.
- Does it fit Holosun 507C optics?
- The optic-cut slide accommodates Holosun 507C patterns with included mounting screws. Co-witnessing requires no additional shims, and the suppressor-height sights align within the lower third of the optic window. Zeroing typically takes 15-20 rounds at 25 yards.
- How long does shipping take?
- Shipping averages 3-5 business days for in-stock items, with FFL processing adding 24-48 hours. Expedited options via UPS or FedEx reduce transit to 2 days. Tracking updates occur within 4 hours of shipment confirmation.
- Can I return it if it doesn't fit my holster?
- Returns are accepted within 30 days for un-fired pistols with original packaging. Holster compatibility issues typically require custom Kydex molding—expect a $75-$120 expense for brands like Safariland or Tier 1 Concealed. Non-returnable after barrel wear or accessory mounting.
- Does this work with TLR-1 HL weapon lights?
- Yes, the MIL-STD-1913 Picatinny rail secures Streamlight TLR-1 HL lights without modification. Activation switches align naturally at the 12-o’clock position, and the 1000-lumen output doesn’t interfere with suppressor gas blowback. Runtime averages 90 minutes on high setting.