G10 XOS-H® in MLOK

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Product Overview

Now shipping with our new custom Torx T20 fasteners!

Sold Individually

XOS-H® in M-LOK - This variation of our traditional G10 XOS Scales offer the same great features, but add an accessory cutout that partners seamlessly with other RailScales products to give you multiple modular options that best fit your shooting style. While most commonly used at the 6 o’clock position with our Karve, Karve-P, Anchor, or RSB, the XOS-H will also fit our QDX Sling Mount as well as additional future RailScales products to mount at various positions based on use. CNC machined out of high quality US made Black FR4 or our brown terrian colored TerraCore (commonly known as G10), our scales provide an umnatched barrier against heat transfer. 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-H scales to our lineup.

The XOS-H cutout slot is compatible with these RailScales products.

The XOS-H cutout slot is compatible with SureFire Scout Light Pro lights (w/ M-LOK mount) with end-user modification. Send an email to for modification instructions. 

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 - 0.53oz, 4-Slot - 0.70oz (w/ hardware)
  • Material: FR4
  • Color: Black FR4®, TerraCore®
  • Hardware: US Made 416 Stainless M-LOKNuts
  • 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 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
  • 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®, Karve®, Karve-P®, Anchor®, RSB®, QDX® are registered trademarks of RailScales LLC.

For all patents and trademarks, see


(76 reviews) Write a Review

76 Reviews Hide Reviews Show Reviews

  • 5
    Great Products

    Posted by Ken Taylor on Apr 7th 2024

    Can't say enough about any of Railscale's products, top notch items.

  • 5
    G10 XOS-H

    Posted by John B. on Mar 30th 2024

    bought these along with the Karve-P, and QTR stop. fits great on my 11.5 Sig mcx spear LT. went with the 4 slot option and give a great had placement on the rail. would recommend

  • 5

    Posted by Chris on Jan 7th 2024

    Really nice to have this on two of my rifles. As expected works great on my sig spear. I also have one on my PSA jakl. The only issue I have with the on my jakl is the scale would not contour to the bottom of the hand guard. I also had to buy longer screws because the outside edge would prevent the m-lock from engaging on the hand guard. No big deal I bought longer screws and was good to go. The only issue is to have it mount to the bottom of the handguard on the jakl is the scale cracked from trying to get it to sit flush with the rail. Hasn't been a issue while running the rifle so I don't really care about the cracking. Not rails scales fault at all. The functionality is what I want.

  • 5
    Xos-h matrix (terra core)

    Posted by Doc J on Oct 18th 2023

    Second matrix xos I’ve bought. Love it. I think some folks find it to aggressive. Gloved up or not I prefer it and it’s multi-directional bite. The terra core color went on to match my sig spear, approximation of color is that of a med coyote (fde) pmag when everything is mounted. If I get another handguard in the same color I’ll do it again. Love it.

  • 5
    excellent all around

    Posted by Jack Previte on Oct 5th 2023

    The XOS has won me over because of the added surface area, improving your ability to grip your handguard while mitigating some of that heat. The XOS-H in particular is great because of the cut-out to mount your MLOK accessories in a tasteful way. nice work, Railscales.

  • 5
    XOS-H Panel

    Posted by Scott on Sep 10th 2023

    Well designed. Works seamlessly with the Karve hand control.

  • 5

    Posted by Derek on Jul 1st 2023

    Fits like a dream, grips like a gun is supposed to, ultra light weight. If you want extra grip go with Matrix pattern for sure

  • 5
    They love me

    Posted by Joe Wasmund on Jun 30th 2023

    This was my first purchase ever and I am super impressed. I got them in the dragon pattern and the grip is phenomenal. The hardware is quality, and the general product feels sturdy. Pattern was uniform all through, with no blemishes. If you're looking at these, you know exactly what you're hoping for. A unique look with performance that delivers. These have it. I did tell Railscales themselves that I loved them in my order and they said it back so if you have some loneliness in your life, they are here for you

  • 5
    Great feel great look

    Posted by Justin k on Jun 29th 2023

    Feels great with comfortability and looks great!