The FN 510 MRD Comp in Flat Dark Earth is a striker-fired 10mm Auto pistol with a 4.43-inch cold hammer forged barrel and an auto-indexing compensator. It has a 15+1 capacity, an optic-ready slide, and a polymer frame with interchangeable backstraps. 
 

Key Specifications 

• Brand: FN 
• Model: 510 MRD Comp 
• Caliber: 10mm Auto 
• Action: Striker Fire 
• Capacity: 15+1 
• Barrel Length: 4.43 in 
• Trigger Pull Weight: 6 lbs 
• Frame Finish: Flat Dark Earth 
• Frame Material: Polymer 
• Slide Material: Stainless Steel 
   

Detailed Features 

• Cold hammer forged, threaded barrel (.578x28) with an auto-indexing compensator 
• Optic-ready, serrated slide finished in Flat Dark Earth PVD for direct red dot mounting 
• Drift-adjustable black iron sights that co-witness with a mounted red dot 
• Ambidextrous magazine release and slide stop with interchangeable backstraps 
• Includes two 15-round magazines, compatible with higher-capacity FN 510 magazines

Owners of the FN 510 MRD Comp in Flat Dark Earth generally react to the compensator and 10mm combination the same way as the black model, noting it helps keep the pistol flatter through faster strings without changing the felt recoil at the wrist much. Some shooters comment the auto-indexing compensator only really shows its benefit once a red dot is mounted, since it is designed to work with a mounted optic.

On ergonomics, the FDE finish gets picked for its visual difference more than any functional change, and the interchangeable backstraps and ambidextrous controls draw the same praise as other configurations in the 510 line. Owners moving from other striker-fired 10mm pistols usually adjust to it quickly.

For value, having two magazines included out of the gate is seen as a plus over pistols that come with only one, and most owner discussion focuses on 10mm ammunition cost rather than any issue with the pistol's finish or trigger.