FREE SHIPPING & FREE RETURNS*

FREE SHIPPING on Over 250,000 Products

Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC, and to all U.S. Military APO/FPO/DPO addresses.

Enjoy our FREE RETURNS

We want to ensure that making a return is as easy and hassle-free as possible! If for any reason you are not satisfied with your purchase, simply return the item within 30 days of receipt, and we'll cover the cost of return shipping. Learn more about our Return Policy.

Shopping Cart
Questions & Answers
Are slims needed to properly time barrel nut? Expert Answer

Yes, you would need to shim the barrel nut for proper timing.

by Ethan C., Gear Expert, October 18, 2019
do i just need to use a normal barrel nut wrench or do i need to buy a different one or does this come with its own proprietary wrench? Expert Answer

The barrel nut uses a standard barrel nut wrench.

by Jonathan D., Gear Expert, June 14, 2018
Customer Reviews
Helpful Positive Review Radical Forearms M-lok by Ryan, March 21, 2021
This is a good rail. It’s very slim and light weight. I would recommend it to a friend. I just wish their finish was a little more resistant to oil. It kind of soaks it in a little. And leaves a dark spot.
1/1 found this helpful
Helpful Positive Review Radical Arms FCR Hand Guard by Pebblebeachkid, December 20, 2017
I was looking for this particular hand guard in 15" to replace the 12" that came on my rifle. Optics Planet had it substantialy cheaper than anyone else and had it in stock. It shipped in 3 days and arrived in 10 days via FedEx surepost. I'm happy wi...
Read More...
1/1 found this helpful
Helpful Positive Review Fantastic Rail by James, Verified Owner, January 20, 2018
I really like this rail, A LOT. It's a slim rail, but fit easily over my low profile gas block. It comes with a steel barrel nut. I really like that the barrel nut is smaller in diameter so the gas tube runs over it, not through it. Saves a littl...
Read More...
1/1 found this helpful
Helpful Negative Review Value priced handguard by Tom Bates, Verified Owner, October 7, 2019
This a great price compared to other hands guards costing two or three time the price of this one. This is a decent hand guard. The finish was not the best ,but acceptable. After I sprayed it down with w-40 and wiped it clean it looked a lot better. ...
Read More...
1/1 found this helpful
Most Recent Reviews Picture is not what you actually get by Zach M, Verified Owner, March 11, 2020
Either False Advertisement or They shipped the wrong hand-guard... I got not only a blemished part but its also the Wrong style... The finish is pretty bad... The hand guard I got has the mounting bolts at the bottom and is clamp style not the style ...
Read More...
1/2 found this helpful
Most Recent Reviews Perfect fit by David Frazer, Verified Owner, August 1, 2019
Found this item, on an awesome sale, for my 9mm carbine build. Perfect fit for an awesome look. Well made with MLOK on the entire length. Came with the barrel nut. Although I don't have to worry about indexing, the barrel nut fits flush and the rail ...
Read More...
Read All 10 Reviews
Color: Black Finish: Type III Class 2 Hard-Coat Anodized Gun Make: AR Platform Gun Model: AR-15 Gun Type: Rifle Handguard Length: 7 inGun Rail: M-LOK Condition: Open Box, Dealer DMO Included Accessories: Standard Quantity: 1

Code: 2CS-HZ-RFFCRS-7FCR-DMO

MPN: R-7FCR-DMO

Product No Longer Available

Product Info for Radical Firearms M-LOK Slim Rail System (FCR)

Save weight and add massive utility to your weapon with the Radical Firearms M-LOK Slim Rail System (FCR). These AR Handguards & Forends made by Radical Firearms feature a Type III Class 2 Hard-coat Anodized Finish for superior resistance to corrosion and abrasion. The Radical Firearms M-LOK Free-Float Rail System (FCR) features a seamless Mil-Spec 1913 top Picatinny rail for the attachment of optics, lights, lasers and other accessories that will improve your aim and performance in the field. Customize your gun with this one-piece Radical Firearms M-LOK Ultralight Rail System (FCR) to expand your tactical capabilities.image

Features of Radical Firearms M-LOK Slim Rail System (FCR):

  • 1 piece free float design
  • Ultra Light and Rigid Design
  • 4140v Steel Barrel nut
  • Seamless top rail
  • Mil-Spec 1913 Top Picatinny Rail
  • M-lok Design to accept any accessory
  • Type III Class 2 Hard-coat Anodized Finish

Package Contents:

  • Radical Firearms M-LOK Slim Rail System (FCR)
  • Handguard
  • Barrel Nut
  • Mounting Screws

Magazine and Accessories

1–21 / 21
Previous
Next

Gun Triggers

1–16 / 16
Previous
Next

Gunsmithing Tools & Accessories

1–14 / 14
Previous
Next

Gun Parts and Accessories

1–30 / 30
Previous
Next

Gun Barrels

1–13 / 13
Previous
Next

Gun Sights

1–19 / 19
Previous
Next

Gun Stocks

1–17 / 17
Previous
Next

Mounts, Rings and Accessories

1–17 / 17
Previous
Next

Related Products to Radical Firearms M-LOK Slim Rail System (FCR)

Radical Firearms M-LOK Slim Rail System (FCR) Unavailable & Discontinued Models

List of Unorderable Models

Open Box, Dealer Demo, Radical Firearms M-LOK Slim Rail; FCR 7 inch, Black, 7FCR , MPN: R-7FCR-DMO , Code: 2CS-HZ-RFFCRS-7FCR-DMO
USED Radical Firearms M-LOK Slim Rail, FCR 7 inch, Black, 7FCR, EDEMO1, Used, Condition Fair, Installed/Mounted , MPN: R-7FCR-EDEMO1 , Code: 2CS-HZ-RFFCRS-7FCR-EDEMO-IN-D
Radical Firearms M-LOK Slim Rail; FCR 7 inch, Black, 7FCR , MPN: R-7FCR , Code: 2CS-HZ-RFFCRS-7FCR
Radical Firearms M-LOK Slim Rail; FCR 10 inch, Black, 10FCR , MPN: R-10FCR , Code: 2CS-HZ-RFFCRS-10FCR
Radical Firearms M-LOK Slim Rail; FCR 12 inch, Black, 12FCR , MPN: R-12FCR , UPC: 816903021796 , Code: 2CS-HZ-RFFCRS-12FCR
Radical Firearms M-LOK Slim Rail; FCR 15 inch, Black, 15FCR , MPN: R-15FCR , Code: 2CS-HZ-RFFCRS-15FCR
Compare (0)