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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
    XOS Rail Covers ROCK!

    Posted by Long Nguyen on Jun 2nd 2020

    Just put a couple 3 slot XOS covers on my POF 12.5” and could not be happier. These exceeded my expectations as they now allow me to have a broader footprint for my grip. The mini dot pattern is just the right amount of texture too. Worth every penny!

  • 5
    Rail scales

    Posted by Tony on May 25th 2020

    Very good product and very well made. It is a quality product that hits right to your rail and is not bulky and is very light. They also provide excellent texture for grip. Two thumbs up!

  • 5
    Great addition to the bottom

    Posted by Tony Pec on May 25th 2020

    These work perfectly for the bottom of rails. Paired this up with two 2-slot G10 scales and it feels fantastic every time I pick up my rifle. I like how much more real estate the xos takes up, yet it's still slick and provides superb heat protection.

  • 3
    QC issues between the 4" and 3" minidot railscales?

    Posted by Phillip on May 23rd 2020

    The railscales feel nice. However there is a difference in how the 3" and 4" minidot scales look. I purchased three of the 3" scales and two of the 4". The 4" scales have more surface texture and are not as dark as the 3" rails. They charge a lot of money for these things and in my opinion they should all look identical.

  • 5
    HTP

    Posted by Jared Munoa on May 21st 2020

    In terms of heat resistance and durability you’ve got an incredible product,. Then add the perfect texture for a secure grip no matter how slippery your hands might be; makes these products got a game changer. MF’n minidots all day!

  • 5
    Xos mlok honeycomb

    Posted by Mark on May 19th 2020

    These panels are pricey but worth every penny! The G10 is light, durable, and comfortable. I've already had several inquries about the product when I took it out. My wife will be ordering a set when she's done with her build. Only down side is the railscales anchor foregrip is out of stock! I have to use my bcm at the moment. If barely fits but not flush. Waiting on the anchor to ship and ill be set. These will be going on all my builds in the future.

  • 5
    XOS 3-slot rail panels

    Posted by Ryan Little on May 15th 2020

    I absolutely love the the look and feel of my XOS 3-slot rail panels on my rifle. Super grippy, comfortable and high quality built parts. Plus they just look cool on my rail, and that’s really what it’s all about, looking cool. Super fast delivery. Extremely satisfied customer and look forward to ordering more for my future builds. Keep doing what you’re doing Railscales!!!

  • 5
    XOS Scales

    Posted by Housecat on May 2nd 2020

    Though these are pricey, I consistently spend hundreds of dollars on them, I LOVE railscales as a company, and they products they make live on every rifle I own, if you're on the fence, go ahead and bite the bullet and try them.

  • 5
    Simply the best

    Posted by Railscales Reviewer on May 2nd 2020

    Hands down, the best covers for your rail. The best for heat mitigation.. the best for added grip and texture.. and definitely the best looking.