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HTP® XOS® in MLOK

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Product Overview

Sold Individually

HTP® XOS® in M-LOK - Now offering a High Temp Polymer (HTP) injection molded version of our G10 machined XOS RailScales. HTP XOS scales are a 3-sided solution that provide more than twice as much grip surface in a similar mounting footprint to our traditional HTP Scales. Adding a 135º wing on each side of the panel allows for the HTP XOS to tightly wrap your rail, and provides one seamless grip area for unparalleled handling and heat protection. They are available in 4 popular industry colors: Black, Flat Dark Earth, Sniper Grey and OD Green. These are sold individually, and will allow you to outfit your firearm with even more added texture, grip and heat protection at a reduced cost. These will accommodate most popular M-LOK handguard rail systems, however please check the specs below to insure these will fit yours.

New HTP IR Material (NIR): Our HTP scales are heat stabilized and utilize 50% long glass fiber for high strength and and high rigidity properties. High HDT of 500º due to crystalline properties and glass loading. This also makes the HTP scales very isotropic to minimize warpage, the material is even suitable as a substitute for die cast metal parts. The new HTP XOS scales also feature a new Near-Infrared compliant upgrade to our material (NIR). The HTP NIR material was originally formulated for a recent military contract and we decided to carry it over to our commercial line of products as well. The IR additive absorbs Short Wave IR radiation (non-visible light), yet prevents the emission of longer wave IR radiation (visible light).  These properties make the material they are added to virtually invisible when viewed using night vision / FLIR equipment. Look for the “NIR” marking on the back of our HTP line. The new HTP NIR will be coming to the rest of our HTP product line by the end of 2024.

Ships Free and Made in USA

  • Quantity: Sold Individually
  • Mount Type: M-LOK
  • Footprint: 3.5-Slots
  • Length: 5.520"
  • Width: 1.150"
  • Thickness: 0.125"
  • Weight: 0.64oz w/ hardware
  • Material: HTP® NIR™ (Injection Molded Glass Filled High Temp Polymer)
  • Color: Black, FDE Tan, Sniper Grey, OD Green
  • 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:

  • ADM MLOK
  • BCM MCMR
  • Bootleg Inc. CamLok
  • CMMG MLOK
  • Dakota Tactical HK Series MLOK - DOES NOT fit the MHS-SD rail.
  • 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
  • KNS Bren 805
  • 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
  • Daniel Defense RIS III 
  • Dakota Tactical MHS-SD
  • Geissele MK18 MLOK
  • Geissele MRGG Mk1
  • KAC URX 4 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
  • SOLGW MK1
  • TriArc TriLok MLOK 

 

ITAR, EAR, and CCL Notice
Some RailScales products maybe controlled for export by the International Traffic in Arms Regulations (ITAR), Export Administration Regulations (EAR) under the Commerce Control List (CCL). These controls take the form of export regulations and license requirements. As part of the express consideration provided for receipt of RailScales goods, technical data and/or services, you, our customer, acknowledge that the export, re-export or other transfer, directly or indirectly, of the goods, technical data and/or services provided by RailScales in violation of U.S. law is prohibited. Customers acquiring controlled goods, technical data and/or services from RailScales shall be responsible for obtaining any necessary U.S. or other government authorization required to ensure compliance with applicable export laws. For further information regarding the applicable laws, regulations, and policies please consult with your export control administrator or contact: U.S. Department of State www.pmddtc.state.gov/ddtc_public

Reviews

(59 reviews) Write a Review

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  • 5
    Good Quality

    Posted by Christopher Ware on Sep 6th 2026

    Didn't fit my purpose on my build. They found a home on another one of my products. Good positive grip and easy to install. Thank you.

  • 5
    HTP XOS

    Posted by isaac croydon on Aug 13th 2026

    Really happy with these RailScales. The HTP XOS feels great in the hand and adds plenty of grip without making the rail feel bulky. Fit and finish are great, installation was easy, and they look awesome on the rifle. Simple product that does exactly what it’s supposed to do. Definitely recommend.

  • 5
    HTP XOS Honeycomb Scales

    Posted by Dave M on Jul 30th 2026

    I ordered these to see how I liked them on my CMT mlok Hybrid rail. I like them so much I'm probably pulling the trigger on the g10 4 slot ones.

  • 5
    Railscales

    Posted by Tracy on Jul 29th 2026

    Craftsmanship at this level costs a little extra. Very impressed with both the g-10 and cheaper variant. Would recommend both. But the G-10 is more rugged. And seems to have a little more grip to it in non gloved hands.

  • 5
    Really quality and well thought out product

    Posted by Dizzle on Jun 6th 2026

    You’re getting what you pay for here. Fit and finish is very high quality. The torque indicating screws make this a breeze and was a great idea. Don’t buy the cheaper alternatives, just get these you won’t regret it.

  • 5
    Best of it’s kind

    Posted by Frank P on May 30th 2026

    Best rail scales on the market, love them.

  • 5
    HTP XOS Scales

    Posted by HTP XOS Mlok on May 27th 2026

    Look great, fit great, and peak my fancy on a number of levels very satisfied! Will be more in my future!!!

  • 5
    The perfect finishing touch

    Posted by Eddie G on May 10th 2026

    Perfect addition to my BA handguard. The finish is super clean and the texture is nice. The dragon scale look really gives a nice look. Always amazing products from Railscales

  • 5
    Htp xos

    Posted by Kyle rewalt on May 2nd 2026

    I’ve tried numerous m lok rail covers from other brands and these are my favorite by far.