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G10 XOS® in MLOK

(140 reviews) Write a Review
$61.00
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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

(140 reviews) Write a Review

140 Reviews Hide Reviews Show Reviews

  • 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

  • 5
    Fantastic

    Posted by Chris Jacobs on Sep 19th 2019

    Put 1 long and 2 short mini dot XOS type 1 on a BCM MLOK rail. Even better than I expected. The fit and finish is fantastic, and feel great to the hand. Now I want them on all my rifles! Yes, they are expensive, but you get what you pay for.

  • 5
    Like it grew there

    Posted by Jack McClane on Sep 19th 2019

    I got the short Honeycomb piece for my PTR 9CT M-lok handguard. Sits perfectly behind my Arisaka finger stop and feels organic to the weapon. It’s not gonna tear up any gloves, but it’s gonna provide a good grip to pull it into my shoulder.

  • 5
    Absolutely perfect...

    Posted by Vincent on Sep 19th 2019

    These are the covers I’ve been waiting for. I’ve tried multiple other cover from multiple other manufacturers but they all come up short compared to these. On any high end AR build there is no question that these should be the rail covers on the firearm. Easy install, great fit and finish, and the perfect amount of grip without being to aggressive. On a side note railscales customer service is second to none. During installation a few pieces of my hardware were lost and after a quick email replacement hardware was immediately sent to me free of charge, even though I was willing to pay. Railscales has a lifetime customer and I’ll be upgrading all my firearms to railscales

  • 5
    Perfect Fit for Wilson Combat MLOK

    Posted by Riktasi on Sep 19th 2019

    They line up perfectly against each other, covering all around the bottom and sides without gaps on my Wilson Combat AR-15 M-LOK rail.

  • 5
    Worth the Cost!

    Posted by Michael B. on Sep 19th 2019

    These things give so much coverage and the additional grip is fantastic. Definitely a pricey option, but the best product in its category by far!

  • 5
    Worth the money. Period. (Fits Aero Precision Atlas!)

    Posted by Alex on Sep 19th 2019

    I gotta admit, I was a little hesitant at first to buy 3 of these PLUS the karve totaling out to almost 5 times the price of equivalent polymer/plastic covers and stops from other brands. Without an ounce of doubt I can say I am glad I went this route. First: The packaging shows that there is pride in the Rail Scales product. It comes with an allen key to install and thread locker on the hardware already. I literally installed 3 of these plus the karve in about 10 minutes and most of that time was just fine tuning the placement for my grip. SO easy. Second: Functionally, this texture and material are perfect. The micro dot pattern is exactly the kind of grippy but not aggressive that is perfect for the un-gloved hand. The fit on my Aero Atlas R-1 rail is excellent leaving a thin gap between each pad to ensure it's actually seated correctly on the rail. The hardware is countersunk flush so you can't feel it at all and the edges are finished with care as well. Third: These things look great. It's nice to have a piece of your rifle that sets it apart and makes it your own but also serves equally in function. Get. These. Covers!