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G10 XOS® in MLOK

(137 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

(137 reviews) Write a Review

137 Reviews Hide Reviews Show Reviews

  • 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!

  • 5
    Best Rifle Accessory Ever

    Posted by Sam W. on Sep 19th 2019

    I can't begin to explain how perfect these are. I got a set of the Xos and the cutout Xos-H to pair up with a karve I already had on my rifle. The minidot doesn't look like it would lock in as well as it does, I got it for the look and was pleasantly surprised how well it grips. I am saving up to put these on every rifle I have. Great stuff Railscales.

  • 5
    Minidot is fire!

    Posted by Jess on Sep 19th 2019

    If you don’t have the xos in minidot then you’re support hand hasn’t lived. The new xos is amazing at heat protection and the minidot texture is some kind of witchcraft creating the nest combination of not too aggressive and grippyness. Looking at it I would never have imagined how grippy it is. Ordering a second set of xos for my other rifle. We need an anchor with minidot!

  • 5
    THE BEST

    Posted by Shawn on Sep 19th 2019

    After trying all of the scales available on the market including the original Railscales, these are without a doubt the best on the market. They have over double the surface area of standard scales and look awesome. The Honeycomb texture is aggressive but not uncomfortable to shoot. Even though they cost a little more than comparable products they perform at a much higher level. Keep up the awesome work guys.