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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