Hi Moses and welcome. This is the Holosun 407C sight, not X2 and is a Red Dot and it is co-witnessed with the iron sights. Cheers and stay safe!

FN 545 MRD Specifications and Features:
FN America Item Number: 66-101919
Striker-Fired Semi-Automatic Pistol
Caliber: 45 ACP
10 Rounds
4.1" Cold Hammer Forged Steel Barrel
Polished Chamber and Feed Ramp
Recessed Target Crown
1:16" Right Hand Twist
Co-Witness Height Iron Sights
FN Low Profile Optics Mounting System
Loaded Chamber Indicator
Fully Ambidextrous Slide Stop Lever and Magazine Release
Polymer Frame with Interchangeable Backstraps
Steel Slide with Front and Rear Cocking Serrations
MIL-STD-1913 Picatinny Accessory Rail
Precision Tuned Trigger
Sight Radius: 6.1"
Overall Length: 7.7"
Height: 6"
Width: 1.45"
Weight: 30 oz
Flat Dark Earth Finish
Includes:
Holosun Red Dot Sight