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AR-15 9MM UPPER RECEIVERS M-LOK ASSEMBLED

AR-15 9MM UPPER RECEIVERS M-LOK ASSEMBLED Reviews & Ratings

The Foxtrot Mike Products 9mm Upper Receiver comes fully assembled and ready to drop on any pistol caliber lower receiver that uses Glock®magazines. With its full-length Picatinny top rail and M-LOK compatible handguard, the Foxtrot Mike 9mm Upper offers plenty of mounting space for optics and other accessories.

While the 5” upper receiver utilizes a standard AR style rear mount charging handle the 9.5”, 10.5”, and 16” upper receivers use an ambidextrous, non-reciprocating forward charging handle.

A unique interlocking connector between the upper receiver and handguard ensures the barrel nut will not work loose over time.

  • Premium Melonite-finished 4150 carbone steel
  • Button-rifled bore, 1-10" twist
  • ½"-36 threaded muzzle
  • Bolt/carrier unit with hard Melonite finish, too

Does NOT work on the BRN-180 lowers

Engineered to function reliably, no matter which manufacturers’ lower it’s mated with, the Foxtrot Mike 9mm Upper Receiver is forgiving enough to cycle even the most economical (we’re not saying "cheap"!) steel or brass cased ammo.

Foxtrot Mike Products MIKE-9 Upper Receivers are not compatible with aluminum cased ammunition, Korean magazines or Spikes Tactical 9mm Glock® lower receivers. Stern Defense 9mm Conversion Adapter is also not recommended for use with Foxtrot Mike Products uppers as it requires adjustment to work properly.

See all of our AR15s and AR15 parts here.

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5 Stars
85%
4 Stars
15%
3 Stars
0%
2 Stars
0%
1 Stars
0%
Reviews Summary
The AR-15 9MM Upper Receiver has garnered impressive feedback from users, frequently highlighting its seamless compatibility with various lowers, reliable performance even under heavy use, and superb customer service from Foxtrot Mike. Some noted minor installation tweaks were necessary, but overall, it’s praised for its build quality and affordability.
What Reviewers Are Saying
Product Quality
85%
Reviewers consistently commend the high build quality and attention to detail in the AR-15 9MM Upper Receiver, citing the exceptional machining and fit with various lowers. This theme accounts for the product’s reliability, with many users reporting flawless function across different ammunition types.
Customer Service
78%
Foxtrot Mike stands out for its excellent customer support as highlighted by numerous reviews. The prompt responses and assistance provided have left a positive impression on users, enhancing their overall satisfaction with their purchases.
Compatibility and Fit
70%
A significant number of reviewers mentioned the compatibility of the upper with various lower receivers, emphasizing the tight and secure fit, which is crucial for performance. Some users, however, noted the need for minor adjustments to achieve perfect functionality.
Reliability and Performance
80%
The upper performed reliably through hundreds of rounds, with users reporting very few malfunctions. Many noted its ability to function well with multiple magazine types, which speaks to its versatility and effectiveness as a PCC.
Installation Considerations
55%
Some reviews pointed out the necessity of making slight modifications for optimal operation, especially regarding the last round bolt hold open mechanism. This theme encompasses the suggestions to ensure compatibility with various lower receivers which vary in design.
5
Perfect performance right out of the box - Not a single issue with Magpul D-50 either!
Mated this upper with Mike-9 complete billet lower. Let's just say that I am extremely impressed with this pistol. A lot of reviews and FM themselves recommend lubing the hell out of it. I anticipated some teething and break-in issues, so I only brought around 300 rounds of brass and steel FMJ, with CLP and lube, but, well, it went through all of that with only 2 minor feed issues. Magazines used: OEM Glock 17 rd x1 Magpul 15 rd x3 Magpul D-50 50rd drum x1 Ammo used: Fiocchi FMJ "Training Dynamics" brass FMJ Some garbage Tula steel case Not a single issue with Fiocchi on any mags, and had 2 failures to feed using steel case and Magpul mag. It also happened on the same mag, probably at the same round count, so it might be more of a mag issue. More impressively, while FM definitely discourages breaking in using high-capacity mags, ESPECIALLY D-50s, it fed all 50 rounds flawlessly, twice. Again, understand round count is still low, but still impressive. Can't wait to shoot more!
5
Hoot to shoot!
Great fit and finish. Snug fit on my FM lower. It ran like a champ with a variety of ammo brands. Very happy with this purchase!
5
AR 15 FM-9
I haven't fired it yet. It's fit nice with FM 9MM lower. For the price it came with bolt and charging handle which was great. I have nothing bad to say about it until I put some rounds down range. will update
5
Not even a single hiccup yet!
I paired it with a psa lower reciever and am using the cmmg mean 9mm conversion magazines and I've yet to have a malfunction! I even get the last shot hold open.. all in all, this is a cool little "bag gun". I normally don't write reviews, but I thought this one deserved one. So if your on the fence about it, I'd go for it.. plus 9mm is usually around 40-50 cents cheaper than 5.56 also!
5
Solid build!!
Really impressed with the 16 fm9 upper. Goes nicely with the fm9 lower. Definitely going to upgrade the charging handle right away. Personally I definitely need two fingers on the side charging. Foxtrot Mike has great customer service as well. They even helped me get a thread protector for the barrel. Unfortunately the muzzle device cant be on my gun with the Safe Act unless I fix the magazine.
5
New shooter impressed with FM9
I'm a long time hunter, but this is my first PCC of this style, purchased to compete in USPSA. There are lots of good technical reviews already, so I'll comment on service, quality, and ease of use. First of all, it took a long time to get the upper thanks to the COVID demand surge. I contacted Foxtrot Mike a couple of times asking for updates and they responded immediately with real processing status. Kudos to them. My California FFL also lost the safety detent and spring when he removed the "illegal" grip, and FM sent me replacements with no fuss. Related to quality, I used an upper from another manufacturer for my USPSA safety check, and the SCM mags I had available all jammed on the second or third shot. However, once the FM upper arrived, the matched set fed 150 rounds from the SCM's with zero issues. Although FM recommends Magpul or OEM mags, the above experience speaks to the quality of design and manufacturing that's apparent throughout the firearm. I work in the machining industry and the fit and finish is exceptional. As a new PCC competitor I've had some coaching from friends that shortened my learning curve. That said, the FM9 is about as user-friendly as it gets. Handed it to my wife and she was dry fire shooting with about 20 seconds of explanation. I'm liking the forward charging handle so far, since my left hand is right there anyway. Seems faster. The only change I've made is switching to an ambidextrous safety, angled for a faster click with my right forefinger. Overall impressed and would highly recommend!
5
Very nice upper
Very nice looking 9mm upper the delivery way faster than expected it was delivered to my door in two days. Did a quick cerakote to it and i couldn't be happier !
5
Extremely Pleased!
Tight connection with my Juggernaut Lower. Very accurate and well built. Put a Romeo red dot optic on top; Rings the gong at a 100 with each trigger pull. I've been firing ARs in military and civilian for over 30 years, side charger is the way to go. Very pleased!
5
Great quality!
Great fit and finish. Fits tight to my lower. Had a few failure to feeds with 124 gr Winclean with the flat bullet profile on the first few magazines. After a couple hundred rounds it ran perfect. It fed Winchester ranger perfectly with no problems. Definitely an awesome upper.
5
New Favorite
I mated the F-M upper to a 80% AR9 lower I recently completed using parts from an AR15 pistol kit. Lower is finished in Cerakote Tactical Gray and accepts Glock mags. First test of only 6 rounds was a success. Further test firing will indicate if buffer and spring need to be changed, but so far, this guns cycles fine. Although the finish is good, I may strip parts for Cerakote, especially the charging handle which is glossy while the upper and handguard are a matte finish with a very subtle color difference. No surprise, the ejection port door matches nothing and will require refinishing. As I do my own finishing, mechanics and fit are more important to me than finish and this upper gets 5 stars for those. Overall, an excellent value and quality and I have another on order as my bride needs one of her own.