Foxtrot Mike Products Ultra Light Free Float M-LOK AR-15 Handguard - Primary Arms Exclusive - 10.5"

Speaking as an engineer, this product is absolutely one of the worst designs I have ever seen. The barrel nut and handguard must mate on a set of 16 flats to align the nut with the hexagonal shaped handguard retaining screw flats, after the nut is torqued to mil-spec tolerances (30-80 ft.-lbs.). Over 80 is excessive. Four Spacers are provided for some leeway when torqueing the nut. The handguard is designed to slide over the nut. NOT on my set. Polishing and filing was necessary before even an EXTREMELY tight fit was possible on just a few of the flat positions. When I thought I had a position where the set-up would allow final torqueing, I torqued down to 60 ft.-lbs.; at which point the barrel nut broke in half! I normally use 50-60 ft.-lbs. on new AR builds, of which I have done several. Bad design and bad execution. I'll look to a different manufacturer and design for a replacement.

great handguard installed on my 7.62x39 16in. barrel took out yesterday an loved it the mounting system works great along with blue Loctite just in case had 15in. before this one much lighter great product and pricing and fast shipping I am in ca. once processed less than a week

Absolute GARBAGE!!! And that’s being generous... wanted a cheap rail but not too cheap and what a waste of money I’ve bought grid defense rails that are 1000x better then this trash... waste of money waste of time absolute disgrace of a company, buying a cloud defense rail now but better off shooting with no rail holding the barrel less pain then buying this and being aggravated

From PA: We're very sorry that you had this experience with this product and we'd be happy to accept a return.

Great fit. Super light.

Have installed 4 of these now and they are excellent. They time up easily and give a solid feel when bench shooting or when slung up with a tight 2-pt sling. You absolutely cannot go wrong with this forearm. No special tools are required.

Indexing the barrel nut so the top rail on the hand guard lines up with the top rail on the upper can be challenging. I use the Magpul Bev Block in the vise and torqued the barrel nut to the minimum, then installed the hand guard with all 8 screws, clamped the hand guard in the vise and continued to turn the barrel with the Magpul Bev Block with an adjustable wrench until the top rails line up. PA sells the Bev Block. Very happy with the hand guard. Cost, weight and sturdiness all get an A

Doesn't line up properly without spacers (not provided) Could use alignment tabs, along sides, below top rail,, like most other hand guards have. So getting this to line up with rail on upper is a bit difficult, without the proper sized washer/spacer. Unless I missed something in packaging or failed to install properly, not sure how,, pretty basic job.. I won't buy this product again.

We are happy that you were able to get that lined up and per our conversation please let us know if we may help you with anything.

I got mine on slick side upper and it looks great. Like that is is slim, seems very light. Nice tight fit, would recommend this for the money its gtg.

Covers a mid-length gas block perfectly. Slimmest hand guard I've run a cross.

I am very happy with this Rail. The Foxtrot Mike is slimmer than the CODA Evolution handguard I have used on other builds. I am not a fan Picatinny, but by using that instead of M-Lok in 12 o’clock position it allows the gas block to sit up in there whereas the coda must have a larger diameter. This rail just covers the mid-length gas block which I like. The CODA I used needed to go past the gas block in ordered to put in a Picatinny section to add a back up sight, if they tried to end just covering the gas block the M-Lok would bottom out on the gas block.
I had no trouble sliding the rail over the barrel nut. No polishing or filing was necessary. Engineer who cracked the barrel nut over tighten it. Foxtrot Mike recommends 35-40lbs of torque. He went to 60. You don’t need a spacer as long as you’re not over tightening it. I did take my time moving up to that flat and checking with the rail to make sure I was aligned properly.