Foxtrot Mike Products Complete 9mm AR-15 Upper 7" for Glock Style Receivers - 8.75" M-LOK Rail - Blast Diffuser

Awesome quality BUT the charging handle is at the front of the barrel under the rail. Because of where it is there is no way to mount a front sight on the rail unless you take out the charging handle and then put the sight on. It must be mounted way back past the action of the charging handle because the handle is to thick. The ambi handle that comes with it will allow you to mount a sight but because the handle is sticking out on both sides of the barrel and it is so thin any little bump on it will cause it to unlodge from its mechanism. At that point it could fall out and if you lose it the upper will not be rackable unless you replace it or improvise. The other issue I had may clear itself up with usage but with the ambi handle installed I can not rack it from the right side, the mechinism binds up.It's a good plinker upper but not sure about a SHTF scenario.

Fantastic upper. I used this to complete a build using a Spikes AR9 lower. Fit perfectly. Accuracy is fantastic. Other review pointed out the issue with MBUS sights and the charge handle not having enough room. This is easily fixed with light sanding of the bottom on the mbus sight.
I learned i do not like the stubby 1 finger charge so i ordered the Para trooper charge handle from FM and really love it as i can get 2-3 fingers on it to charge and its made of steel. There is more room under the rail with this also. I Recommend this upper. Its fun, accurate, and reliable. I have put 700 rds through it so far and it eats all ammo including HST's

Love it! Accuracy is great and it is so much fun to shoot. I do recommend gun grease on the slide for the forward charging handle. Works like a charm.

Can not speak for the new charging handle as I ordered the older style. My diamondhead sights mount well with no interference.

I also want to love it. The forward position of the charging handle doesn't bother me, with the SPARC I have clearance to manipulate the handle, but the bolt does not go far enough back to easily lock back. I have tried 2 lowers, thinking it may have been the spacer at the back of the buffer tube, but it is a problem on both lowers, even with the spacer removed.

If I slam the bolt back with the charging handle, while holding the bolt catch, it does lock back, but not with a gentle motion

It makes for a very light, very fast, and extremely accurate build. I run it on a standard lower with a Larue MBT trigger and Mean Arms Endomags, and thus far it has cycled flawlessly. LRBHO has never failed in more than 800 rounds.

I started building an AR pistol for my daughter to train with at the range. She had trouble keeping correct form with the weight of rifles and AR pistols due to excessive time with YouTube, and not enough time actually using her arms. :) This weapon has become the family's favorite range weapon. My sons, constantly pick her weapon over their own. My only issue, which is not the fault of the upper, is that I never thought that I would enjoy this upper so much. I need to suppress it, especially with the charging handle setup. My suppressor is too wide for the cage, so I have to get a longer barrel, since a new dedicated suppressor is currently out of the question.

Love this upper. Really high quality, only one malfunction after 500+ rounds. Accurate, lightweight. Charging handle is a tad small but works fine. Bolt is great, high recommend FM products

Cycles flawlessly. Shoots straight. Easy to clean.

Charging handle is kinda small. Got the front iron sight to attach by wiggling the charging handle out a little bit. I’m thinking about installing some small screws in it to keep it steady now.

The one issue I have is either the flash can was installed improperly or the threads on the end of the barrel are not straight, but the can is slightly out of line with the barrel and touches one side of the hand guard. It doesn’t affect performance but it does affect the use of M-Lok attachments on that part of the rail. It’s not noticeable unless you look closely, but I‘m thinking about getting a new muzzle device.

Eventually I would like to get a shorter barrel with a CMMG 9mm Slim AR suppressor.

Overall the weapon is great for my wife who has trouble with her hands and wrists. The weapon is easy to control and doesn’t hurt her to use. I love it!

love it. super fun and very accurate. Fit perfectly on my baby snek lower from psa. so far no hiccups. only been to the range once with it but im really enjoying it. Side charging handle was a little stiff but with some oil, it works great!!

I bought this upper and I could not be more pleased with the quality workmanship. Foxtrot Mike FM-9 was recommended to me and I have to say, this is probably my favorite gun to shoot. I even let my brother and crazy sister-in-law shoot it, and they loved it so much that they bought one too!

Also the Foxtrot Mike customer service is a great. I had a missing anti-walk pin for the trigger on the lower that I bought to couple with this and I received a response in less than 24 hours after I contacted them. They sent me a replacement the next day! I completely recommend this product. Of course, Primary Arms is awesome as well

1) Charging handle is too small and requires dragging your knuckles along the rail. I wear gloves, so it was not too bad I can live with that. I will probably machine a larger offset one to fix this later.
2) No way to mount any front sight due to high small charging handle. Even if you get it on there, now you drag your knuckles across that.
3) Does not fit on my New Frontier glock lowers. Most bummed about this. Rear takedown barely goes in with too much effort. Bolt hangs inside buffer tube due to being too high. Deck height is just a few thou too high not allowing the two to mate up right resulting in the bolt riding too high. Same fit on 3 different lowers.

Otherwise it looks well made. I'm debating modifying my NF lower or doing a build on a AR lower using endomags. Did not want to buy more new mags.