I bought an FN FNX-45 a few days ago and I was able to go shooting with it on the 4th... 'Merica! Anyway, here are my initial impressions:
The FNX series of pistols are an upgrade to FN's FNP series. The FNX-45, specifically, arrived to the party a little less than a year ago and differs from the FNP-45 with respect to barrel feed geometry and case support in the chamber. The magazines are also slightly different as the FNP-45 mags had feeding problems with certain types of ammo. Other than that, the FNP-45 and FNX-45 are functionally and externally the same. The FNX and FNS series of pistols are made in the USA.
The handgun is a DA/SA semi-automatic with a magazine capacity of 14/15+1. It weighs 33.2oz unloaded. The pistol has ambidextrous magazine releases, slidelock levers, and manual safeties. The pistol is very large, and is comparable in size to my USP9, M9, and SIG 220/226. I'll provide some comparison pics later. I thought the grip would be too large and uncomfortable to manage with my medium-ish size hands, but that turned out to be untrue. The grip is checkered on the sides, has horizontal serrations on the frontstrap. The backstrap is replaceable and comes with flat and arched checkered pieces. I found the arched piece to be more comfortable to use. FN apparently makes 2 more backstraps for the FNX-45 that are the same profile as the flat and arched checkered pieces, but are horizontally serrated like the front strap. My pistol only came with the checkered pieces. Overall, the grip is comfortable and the trigger is easily reach even in DA mode.
The pistol's ambidextrous controls are effective and symmetrical on both sides. The manual safety, in particular, has three positions. The up position puts the pistol on SAFE, the middle position is FIRE, and the down position is the spring loaded decocker. The FNX-45 can safely be carried condition 1 with the hammer cocked and safety on, like a 1911. It can also can be carried with the hammer down and safety off for a DA first trigger press, or it can be carried with the hammer down and safety on. I do have a gripe with the manual safety in that the right side safety interferes with my index finger when I decock the pistol. This forces me to remove my right index finger from the gun to decock the pistol easily.
The DA trigger press stacks like any handgun with a coiled mainspring, but it is smooth and comparatively light to other modern DA/SA semi-autos. The reset to SA is very positive both audibly and tactilely. The SA press is very light with a minor amount of takeup and relatively crisp break.
In general, I like the stock sights on the pistol. They are of the white 3-dot variety, which I normally dislike. What makes them different from your average 3-dot sights are that the front sight white dot is much larger than the rear sight dots drawing your eyes to focus on the front sight. When not using night sights, I typically like all black sights, a white dot front sight and black rear sight, or gold/brass bead front with black rear sight. The stock sights, however, work ok and I will probably leave them alone.
The pistol is easily field stripped much like any other modern pistol, and the recoil spring is captive. The internal parts are easily accessible for cleaning, and look well made. The slide is also easily detailed stripped, allowing you to clean the firing pin channel and extractor. The frame, however, is difficult to detail strip since it pretty much requires you to break the manual safety to get to the internals. I normally like to be able to detail strip my handguns so I can perform any "armorer" level maintenance that may be required on the pistol. The design feature on the FNX pretty much makes the end user unable to detail strip the frame. Given the fact that the FNX-45 looks well made and the internals are strong, this will likely be a non-issue at least for a long time. That being said, it would have been nice to be able to completely take apart the frame.
Like I mentioned earlier, the magazine capacity is 14+1 with flush fit magazines and 15+1 with the club foot looking magazines shown in my pictures. My pistol came with 3 - 15 round magazines. I've read that the FNP-45's magazines are able to be used in the FNX-45 but not the other way around. Unfortunately, magazines are expensive at $50 a pop as listed on the FNH USA website.
I put 200 rounds of Blazer aluminum cased 230gr FMJ and 50 rounds of Winchester Ranger-T 230gr hollowpoints (RA45T) yesterday without any issues. While this isn't statistically significant, it is a good starting point. The FNX-45 is the softest shooting .45 ACP handgun that I own (5" 1911s, SIG P220, S&W 1917 reproduction, and S&W 325 Thunder Ranch). From what I've read the barrel and slide travel together almost twice as far before unlocking compared to other modern pistols. This feature is what is supposed to reduce the felt recoil.
Overall, the pistol seems solidly built, and it's very shootable despite its caliber and size. I don't own any holsters for it yet, so I can't speak to how it carries OWB or IWB. I will provide an update once I shoot it more and have had the opportunity to carry it. The FNX-45 currently has little aftermarket support. There are holsters and sights available for the FNP-45, which should be compatible with the FNX-45. Other than that, there isn't much else. While sights and holsters are what I really care about, the lack of other aftermarket products will probably turn off prospective purchasers. I hope this changes, because I really like this gun and would like to see it succeed in the market.
Likes:
Sights
DA/SA trigger
Magazine capacity
Comes with 3 magazines
Shootability
Dislikes:
Unable to detail strip frame
Lack of aftermarket support
Magazine prices