G10 XOS® in MLOK

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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
  • 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 Parts HK Rails
  • Hodge/FN Wedgelock
  • KNS Bren 805
  • 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 
  • Vltor Freedom

Does not fit:

  • Brownells BRN-180
  • Black Rain Ordnance MLOK
  • Daniel Defense RIS III 
  • KAC URX 4 KeyMod/MLOK
  • 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 Virtus Non-SD
  • Sig Sauer MPX Factory 4" & 8" MLOK Rail
  • SOLGW Wedge Lock MLOK
  • SOLGW M89/L89 MLOK
  • TriArc TriLok MLOK 



© 2024 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


(131 reviews) Write a Review

131 Reviews Hide Reviews Show Reviews

  • 5
    G10 scales

    Posted by John on May 24th 2024

    Have these on all my rifles. They are excellent

  • 5
    Rail cover

    Posted by Joseph Garcia on May 18th 2024

    Definitely best products in the industry ,money well spent

  • 5
    Awesome grips!

    Posted by John Sullivan on May 18th 2024

    The grips are amazing. I am very happy with these grips and will recommend them to everyone. Thanks railscales! Great products.

  • 5
    The best

    Posted by Matthew on Apr 18th 2024

    Extremely high quality. Worth every penny. I have Railscales on all of my rifles.

  • 5
    G10 XOS/XOS-H Honeycomb 4 Slot

    Posted by Nick Knowlte on Feb 7th 2024

    With no reviews regarding placement of these rail covers on an LWRC M Lok rail, I thought I would help the community out. These fit wonderfully on this rifle, with form and function being exquisite as well. I’m not sure it’s possible to give less than 5 stars for this product, excellent quality control and engineering are obviously of the highest priority at RailScales! Keep up the great work, I’ll be back!!

  • 5
    G10 XOS

    Posted by Devin on Jan 22nd 2024

    Product is amazing! Easy to install and feels great in the hands! I’m planning on getting the version with an install hope for a grip!

  • 5
    Amazing Product!

    Posted by John Bonaccorsy on Jan 3rd 2024

    I bought these and tested them out during a 3 day rifle instructor course through my agency and I was nothing but impressed! Not once did my rail heat up like it used to when I used other brands of heat protection. Not only are they practical but they also look good. Had a couple instructors ask where I got the Rail Scales from while on the firing line. I’ll definitely be putting these on all my rifles!

  • 5
    Best grips

    Posted by Alex on Dec 6th 2023

    A++ product and does what it’s suppose to do. Great team behind the product !

  • 5
    Very cool

    Posted by Bradley Briscoe on Nov 29th 2023

    Awesome design, texture and overall aesthetic!!! Was super excited to see this particular model offered again and immediately bought another set.