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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
    Expensive, but great product

    Posted by Michael on Jan 28th 2021

    I bought this after reading about them. Never heard of railscales before. So overall, its very sturdy and well made. Its made of a patented material of theirs which looks and feels like some type of fiberglass/plastic material. I got the matrix design and its an aggressive pattern. A little rough on bare hands, perfect when using gloves. Only downside is cost. Maybe cut out the super fancy box it comes in or find some other way to bring down the price to make more people interested. Fits my midwest G4M mlok rail perfectly.

  • 5
    Perfection

    Posted by Patrick on Jan 25th 2021

    Was a bit nerves to order the XOS and XOS-H for my Armalite AR10A after not seeing it on the compatibility list. Decided to go out on a limb and order and I’ve got to say they fit perfectly on the Armalite M-LOK rail. Best grips I’ve ever put on a rifle and will definitely be ordering from you all in the future. Great product!

  • 5
    G10 XOS

    Posted by J Laferriere on Dec 8th 2020

    Far exceeded expectations. They fit perfectly on my LMT MLC & Geissele MK8

  • 5
    4 slot matrix m lok

    Posted by Dylan on Nov 18th 2020

    They fit very very well on my bcm rail, look great. The matrix design is fairly aggressive so that’s something to be aware of with this pattern. I like it, it gives a really solid grip. I can not say how they hold up to eat and abuse since I have only put them on the rifle and haven’t been able to test there durability or how well they keep heat away from your hands but they cover the rail all the way around if the you get three rail covers for each side of open rail. Price is a little much but they seem to be worth the money and very well made.

  • 5
    Amazing

    Posted by Isaiah Gonzalez on Nov 17th 2020

    I’m blown away by the quality of these scales, G10 feels amazing on the hands.

  • 4
    Great Product

    Posted by Jonathan Fincher on Nov 16th 2020

    I recently purchased the XOS covers after months of researching and trying to decide between the Rail Scales and other brands. I finally pulled the proverbial trigger and ordered and couldn't be any happier. I placed these on a Primary Weapon Systems MK111 Pro upper and the fitment was fantastic. There is about 1/8 of an inch between the covers, and they lock up nice and tight. I like them so much, I am ordering another set as well as the Karve. Will definitely continue to outfit my guns with these, and would highly recommend to anyone who may be on the fence.

  • 5
    Top Quality

    Posted by Christopher A on Oct 27th 2020

    I purchased two G10 XOS in the mini dot pattern. They fit perfectly, and are easy to install. They even include the Allen Keys for the install. They are very very log weight. They feel great in my hand. I want to order three more in the future.

  • 5
    G10 XOS in MLOK

    Posted by Andrew m on Oct 20th 2020

    Exactly what’s shown in picture. I got the matrix grip and love it. Looks as a good as it feels. Will definitely order more!

  • 5
    Epic!

    Posted by Gene on Oct 9th 2020

    Amazing quality, and changes the whole dynamic of your weapon. Highly Recommend!!!!