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 fitment@railscales.us 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
- 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
- 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
- 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®, Karve®, Karve-P®, Anchor®, RSB®, QDX® are registered trademarks of RailScales LLC.
For all patents and trademarks, see www.railscalesip.com
