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G10 XOS® in MLOK

(137 reviews) Write a Review
$61.00
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RailScales 4-Slot Dragon TerraCore® G10 XOS® & XOS-H® M-LOK Scales, Karve-P® FDE M-LOK Hand Stop, QDX® Sling Mount | 14.5" 5.56 URG-I Upper, Geissele Mk16 DDC Rail, Daniel Defense 14.5" 5.56 Gov Barrel, L3Harris NGAL Laser, Surefire M640U-Pro Light w/ CSP-07 Switch, Surefire 4-Prong 5.56 SOCOM Flash Hider w/ Surefire SOCOM556-RC2-DE Suppressor
UPC:
854417008254
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Product Overview

Now shipping with our new custom Torx T20 fasteners!

Sold Individually

XOS® in M-LOK - An evolution of our traditional G10 machined RailScales, XOS Scales are a 3-sided solution that offer twice as much grip surface in the same mounting footprint. Adding a 135º “wing” on each side of the panel allows for the XOS to tightly wrap your rail, and provides one seamless grip area for unparalleled handling and heat protection. CNC machined out of high quality US made Black FR4 or our brown terrian colored TerraCore (commonly known as G10), our scales provide an unmatched barrier against heat transfer. Available in four popular textures and varying lengths, these scales allow for multiple setups no matter how much rail space you have available. They will accommodate most popular handguard rail systems, however please check the specs below to insure these will fit yours. 

TerraCore complements our line of Terra Bronze anodized and FDE polymer components as well as third-party branded tan anodized or Cerakoted rail forends. Unlike coating or painting options, our TerraCore scales are colored throughout and remain so after CNC machining operations. Offered in the same patented textures and resilient heat protection options you've come to expect. We are excited to introduce TerraCore XOS scales to our lineup.

Ships Free and Made in USA

  • Quantity: Sold Individually
  • Mount Type: M-LOK
  • Footprint: 3-Slots, 4-Slots
  • Width: 1.165"
  • Thickness: 0.125"
  • Length Dimensions: 3-Slot - 4.724", 4-Slot 6.300"
  • Weight: 3-Slot - 0.64oz, 4-Slot - 0.82oz (w/ hardware)
  • Material: FR4
  • Color: Black FR4®, TerraCore®
  • Hardware: US Made 416 Stainless M-LOK Nuts
  • Fastener: US Made T20 Torx Fasteners w/ Nylon Thread Patch

Fitment Info: Fits rails with mounting flats of 0.678" or narrower including the following:

  • AAC Teardrop
  • ADM MLOK
  • BCM KMR/MCMR
  • Bootleg Inc. CamLok
  • CMMG KeyMod/MLOK
  • Dakota Tactical HK Series KeyMod/MLOK
  • Daniel Defense Slim
  • Daniel Defense MFR MLOK - DOES NOT fit the MFR XL Rail.
  • Fortis Night Rail
  • Geissele 4-Sided Rails (Mk4*, Mk8)
  • Geissele MK16 (URG-I)
  • HK USA MR556 A4 M-LOK Rail - Only fits at 6 o'clock, DOES NOT fit at 3 or 9 o'clock.
  • HK Parts HK Rails
  • Hodge/FN Wedgelock
  • LMT MRP-L MLOK
  • Midwest SSK/SSM
  • Midwest G3KL/G3ML
  • Midwest Gen 2 Extended AK MLOK
  • Parker Mountain Machine Scar Bottom Rail
  • PWS Mod 1/Mod 2
  • Sig Sauer Canebrake SD 
  • Sig Sauer MCX-SPEAR LT - Only fits at 6 o'clock, DOES NOT fit at 3 or 9 o'clock. 
  • Sig Sauer MCX-SURG SD Rail - Only fits at 3 & 9 o'clock positions, DOES NOT fit at 6 o'clock position. 
  • Sig Sauer MCX-SURG Low-Profile Rail - Only fits at 6 o'clock, DOES NOT fit at 3 or 9 o'clock.
  • Sig Sauer MCX Virtus SD 
  • SLR AK ION
  • Vltor Freedom

Does not fit:

  • Brownells BRN-180
  • Black Rain Ordnance MLOK
  • CZ BREN 805
  • Daniel Defense RIS III 
  • Geissele MK18 MLOK
  • KAC URX 4 KeyMod/MLOK
  • KDG MREX SCAR Rails
  • Larue 2.0 Stealth MLOK 
  • Noveske NSR, NHR, NSRM
  • Radian Model 1
  • Radical Firearms MLOK 
  • Sig Sauer M400 MLOK/Tread
  • Sig Sauer M400 X-Series SDI
  • Sig Sauer MCX Rattler Non-SD
  • Sig Sauer MCX-SPEAR (308)
  • Sig Sauer MCX-SPEAR LT SD Rail 
  • Sig Sauer MCX Virtus Non-SD
  • Sig Sauer MPX Factory 4" & 8" MLOK Rail
  • SMOS Arms GFY MLOK
  • SOLGW Wedge Lock MLOK
  • SOLGW M89/L89 MLOK
  • TriArc TriLok MLOK 

 

 

© 2025 RailScales, LLC. All Rights Reserved. RailScales®, XOS®, XOS-H®, Black FR4®, TerraCore®, Terra Bronze® are registered trademarks of RailScales LLC.

For all patents and trademarks, see www.railscalesip.com

Reviews

(137 reviews) Write a Review

137 Reviews Hide Reviews Show Reviews

  • 5
    perfect for Geissele rails

    Posted by Brent C on Apr 25th 2020

    These are the best looking rail covers for the Geissele type rails. I'm running them on a Mk16 and they leave just enough gap for airflow while giving you a nice fat hand hold. As always with Railscales products, fit and finish are perfect.

  • 5
    Excellent Rail Covers

    Posted by Brendan on Apr 13th 2020

    I'm using these rail panels on my strike industries Crux HK handguard in MLOK and it's fantastic! Clean, slim and durable.

  • 5
    Best You Can Get!

    Posted by Trevor Conger on Mar 23rd 2020

    To be honest, the price of the railscales made me hesitant to purchase them. But since I have a very nice AR build, I did not want to throw some cheap alternative product on it. After putting them on and giving them a test, I can honestly say this is a great product! I would definitely recommend the XOS and the Karve for your guns! They provide excellent heat resistance and great stability. Overall, they make some great products and the employees are very helpful!

  • 5
    BIG GIRLS NEED LOVE TOO

    Posted by Erick Rittle (IG HANDLE : bleed_rwnb_1776) on Feb 17th 2020

    This near full wrap profile is beefy yet super functional. The light weight material is like air and the full purchase you get is impressive...a great look and different cosmetic & functional options offered other than the traditional scales. VERY HAPPY!

  • 5
    Very happy with XOS scales

    Posted by Joseph Maddox on Feb 2nd 2020

    Was very satisfied with XOS scales and its texture. I got them in Matrix pattern and was surprised at just how much traction they provide. The contour is perfect for the handguard on my DDM4V7.

  • 5
    Best Rail Covers available period!

    Posted by Mickey Blackmon on Dec 4th 2019

    I have wasted a lot of money on rail covers but so learn from my mistake "Buy once, cry once"! Best Rail covers in the Wild.

  • 4
    Great rail guards for MLOK & Keymod!

    Posted by Russ M. on Nov 26th 2019

    I have these on 4 different ARs in both keymod and Mlok. There really isn't anything better out there and the price reflects it. I will use these on two future builds at least. The only other thing that compares are ones made from titanium and those take forever to get, plus they're just as costly, if not more, since these cover a lot more. I have some Ti grips and they're not as functional. Railscales go on my competition and self defense pieces. Flat bottoms help for mounting, but note the three sided scales will not fit well on some round handguards, like on a curved carbon fiber tube. The thin scales are better for those, applications, but still might be a little "flat". There's ways to get the fit right.

  • 5
    XOS Mini Dot

    Posted by Evan on Nov 9th 2019

    Nothing compares in quality and looks! My second set and always satisfied!

  • 5
    Form Fitting, Low Profile, Amazing Grip

    Posted by Benjamin Londrillo on Sep 30th 2019

    Was looking for something that not only worked great, but integrated seamlessly with my rail with a low profile. I also didn't want to put an ugly guard on my expensive rail and build that I worked so hard to make perfect. These grips were exactly what I was looking for. Offer great ergonomics, aesthetics, and hand protection all while improving the overall look of my build. Super lightweight, durable, and just plain sexy. Fit my BAD Rigidrail like a glove. People ask me where I got them often. Highly recommended