FN 545 MRD .45 ACP
Model: 66-101387
FN 545 MRD .45 ACP
Model: 66-101387
Full Specifications
About This Firearm
The FN 545 MRD is FN's striker-fired .45 ACP, built on FN's 509 platform and holding 15 rounds. At $930 it is for the shooter who wants .45 ACP in a modern optic-ready duty-size gun and is choosing between it and the Glock G21 Gen5 MOS.
The slide is cut for most miniature red dots and ships with four mounting plates, and the steel sights are tall enough to co-witness with most of them. Against the G21 Gen5 MOS, the 545 holds two more rounds on a 4.1" barrel that is 0.51" shorter, and weighs 0.9 oz more. The HK HK45 is a DA/SA gun that holds 5 fewer rounds for $19 more, and HK lists no optics-ready HK45. The FN FNX-45 Tactical, FN's hammer-fired .45, has a threaded 5.3" barrel and a decocker, and costs $464 more.
Buy the 545 MRD if you want a striker .45 with the grip and controls of FN's 9mm strikers and a dot mounted without a gunsmith. Skip it if you want the larger holster and parts market of the G21 Gen5 MOS, or if you plan to run a suppressor, which calls for the FNX-45 Tactical or FN's 545 Tactical.
Best For
Strengths & Limitations
- Two interchangeable backstraps and FN's enhanced grip texture let you size a large .45 grip down to your hand.
- Four MRD mounting plates ship with the gun, so most micro red dots mount without buying extra parts.
- Fully ambidextrous slide stop and magazine release suit left-handed shooters and weak-hand drills.
- The grip is 6.0" tall and 1.45" wide, which puts it past most concealed-carry use. The G21 Gen5 MOS is 1.38" wide.
- Holster options are thinner than for the G21 or for FN's 9mm pistols. Confirm your holster maker lists the 545 MRD by name.
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Glock G21 Gen5 MOS .45 ACP
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Smith & Wesson M&P 45 M2.0 .45 ACP
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Sig Sauer P320 Full Size .45 ACP
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Frequently Asked Questions
What is the difference between the 545 MRD and the 545 Tactical?
The Tactical has a threaded barrel for a suppressor, while the MRD is the standard optics-ready model.
Do FN 545 magazines work in other FN .45s?
FN does not state cross-compatibility with the FNX-45 on the 545 product page. The 545 ships with its own low-friction follower, nickel-coated steel magazines.
Which red dots fit the 545 MRD?
FN says the slide is cut to mount most optics with the four included plates, no gunsmith needed. Check FN's plate chart for your specific dot.
Is there a state-compliant 545 MRD?
Yes. FN offers the 545 MRD with two reduced-capacity magazines, and in black or FDE.
