The FN 545 MRD is a single-action-only .45 ACP semi-automatic pistol with a 4.1-inch hammer-forged barrel, optic-ready slide, and Flat Dark Earth textured polymer grip. It ships with 10+1 capacity and no manual safety. 
 

Key Specifications 

• Brand: FN 
• Model Name: 545 MRD 
• Caliber: .45 ACP 
• Action Type: Single Action Only (SAO) 
• Capacity: 10+1 rounds 
• Barrel Length: 4.1 inches 
• Overall Length: 7.7 inches 
• Weight: 30 oz. 
• Finish Color: Flat Dark Earth 
• Sights: Co-Witness Height Sights (Fixed) 
• Grip Material: FDE Textured Polymer 
• Trigger Type: Standard 
• Safety Features: None 
   

Detailed Features 

The optic-ready slide has a direct-mount cut for micro red dot sights, which co-witness with the fixed steel sights. Controls are ambidextrous for left- or right-handed shooters. The FDE textured polymer grip is lightweight and provides good traction in most conditions. The hammer-forged barrel has a target crown. No manual safety — the pistol relies on the SAO trigger geometry. 
 

Usage 

The FN 545 MRD is positioned as a duty/defense pistol in .45 ACP. The optic-ready slide makes it a practical platform for shooters who want to run a red dot on a full-power cartridge. The FDE finish suits those who prefer a tactical appearance or coordinate with FDE accessories. At 30 oz it's manageable for the caliber.

The FN 545 MRD in FDE draws consistent praise for its build quality and reliability. FN's manufacturing reputation carries real weight with buyers, and the 545 generally lives up to it in range reports. The pistol cycles reliably with standard .45 ACP loads, and accuracy is solid.

The optic-ready capability is the most frequently cited selling point. Shooters who want to mount a red dot on a .45 platform find the co-witness height sights and direct-mount optic cut a clean implementation.

Ergonomics are well-received. The grip fits comfortably across various hand sizes, and the ambidextrous controls are appreciated by left-handed shooters and those who train with both hands. Adjustable backstraps accommodate different grip preferences.

The FDE finish splits opinion along aesthetic lines. Some buyers choose it specifically for the tactical look; others prefer the standard black finish. Functionally it performs the same.

No manual safety is either a feature or a concern depending on the shooter's training and preference. Some users coming from manual-safety platforms take time to adjust. Pricing is competitive within the FN lineup but draws the usual comparison-to-competitors discussion.