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FAB Defense Standard Picatinny Rail for AR-15/M4/M16 Handguards
As Low As $16.49
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Most Helpful Positive Review Great Product...
The picture is deceiving...but it's not a bad thing. There are actually 6 mounting nuts and bolts...not 3. Like others said some small modifications were needed but it fits well and it's strong. YouTube has good videos on pulling back the D ring without using a special tool.
Most Helpful Negative Review Offering Two models would be better
I bought 2 separate uppers with standard M4 handguards, and I had to enlarge 4 of the holes to fit this accessory. There is a caution in the catalog about this, but I thought I was getting the right hand guards. That's not very customer-orientd. Why not make a model that fits my handguards? Seems li...
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Inexpensive and easy way to modernize plastic handguards

by Brendan, Verified Owner from IA, United States Written on October 9, 2025
Unsure if it would fit my A2 hand guard based on other reviews, but it installed without any modifications. Some of the screw taps have extensions that were hard to line up, but I got them to snap into place with a bit of force. The others were slightly offset from center, so I suggest using blue Loctite to keep everything secure, though the ridges on the mount side line up with the ones on the handguard, so I doubt that it would move much. Overall, feels very sturdy and well made. Good option for someone who wants to add a pic rail to a plastic hand guard.
Pros:
  • Good product for the price
  • Included Hardware
  • Fits on a 15 hole oval profile A2 handguard
  • Feels sturdy for polymer
  • Angle correction, mounts straight
Cons:
  • Some holes are off center
Would recommend: Yes
Was it helpful to you? Yes | No

FAB handguard picatinny rail

by GunChango, Verified Owner from ID, United States Written on March 11, 2025
Worked great. Exactly what I was looking for. Had to do a little modification on the handguard, but it only took a minute. It slants one way to make up for handguard slote.
Pros:
  • Well built and looks great
Cons:
  • cost
Would recommend: Yes
Was it helpful to you? Yes | No

FAB Defense Picatinny Rail

by Bob1965, Verified Owner from TN, United States Written on June 20, 2024
Fits perfectly on a PSA handguard. No modifications required.
Would recommend: Yes
Was it helpful to you? Yes | No

As advertised

by HSB, Verified Owner from NC, United States Written on March 15, 2024
It does what it says that it does: it adds a rail to your plastic handguard. It's light, it fits, and you can add accessories like flashlights, vert grips, or bipods. It fits up well and was clearly designed with a bit of forethought. It can be placed as far forward or rearward as you would want on the rifle length or carbine length handguards. You could definitely break it if abused, but it seems every bit as strong as the factory handguard.
Would recommend: Yes
Was it helpful to you? Yes | No

Doesn't work on Colt M4

by mike, Verified Owner from MI, United States Written on January 23, 2024
The aluminum baffles inside my Colt M4 handgaurds are not removable [glued in place]. Bored out one of the vent holes in the baffle, but the screws were not long enough to grab the rail. To much modification needed to accommodate the rail. However, the rail looks well constructed and would have worked well for me if it would have fit on my M4
Would recommend: No
Was it helpful to you? Yes | No

cheap option in a pinch

by Joe, Verified Owner from PA, United States Written on January 5, 2024
Not bad for the price. The angle that creates a parallel plain with the barrel is a nice touch. It looks a little off once installed. I am going to keep it installed, but if you're on the fence, I would just keep the regular handguard look. The vertical foregrip I installed is nice and perpendicular, but it allows me too much torque and creates a lot of give with the handguard (as it wasn't designed to experience it like that). That being said, if you really want to attach to this style handguard, I like the piece.
Pros:
  • perpendicular attachments
Cons:
  • feels flimsy
Would recommend: Yes
Was it helpful to you? Yes | No

FAB defense picatinny rail

by Hector Cortes, Verified Owner from CA, United States Written on October 24, 2023
Good fitment on my colt m4, overall satisfied with my purchase.
Would recommend: Yes
1 of 1 found the following review helpful.
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Nice way to get a rail easy.

by Doc, from AL, United States Written on September 5, 2023
I wanted to add a rail without changing out my heat shield. This is quick and easy. I would have given it 5 stars, but one of the holes didn't line up right. A few seconds with a file and all was fixed. This is tight and solid and works great.
Would recommend: Yes
Was it helpful to you? Yes | No

not terrible

by LetsGoBrandon, Verified Owner from MN, United States Written on May 8, 2022
For a simple add on to a standard A2 handguard, it does the job. I was able to mount a forward grip. It's pretty sturdy, durable. You're getting what you pay for. Its a cheap fix to not having to change out the A2 handguard and shell out 100$ + for a new handguard.
Would recommend: Yes
Was it helpful to you? Yes | No

Does not fit standard 9" handguards

by Shipwreck68, from IN, United States Written on April 11, 2022
Does not fit standard 9" handguards. These appear to only fit 6" handguards. The holes do not even line up correctly for 9". Someone wrote they had to do some Dremmel work...this should not be the case for any quality pieces.
Pros:
  • None
Cons:
  • Does not fit.
Would recommend: No
1 of 3 found the following review helpful.
Was it helpful to you? Yes | No
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