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Product Overview

Now shipping with our new custom Torx T20 fastener!

Karve® - Offering a wide range of functionality, our patented Karve Bi-Directional Stop is our most popular forward hand control product. Machined out of 6061 billet aluminum, and available in 2 anodized finishes with a Type 03 Hardcoat anodizing. The Karve is a compact and ultralight solution for multiple shooting styles and is reversible to accommodate a “push” or “pull” style grip. Compatible with modern M-LOK rail systems, it only takes up 1 M-LOK slot, which will allow it to fit inside the cutout of our XOS-H Scale, making the Karve one of the most versatile solutions on the market.

Ships Free and Made in USA

  • XOS-H Scale Compatible
  • Mount Type: M-LOK
  • Footprint: 1-Slot
  • Height: 1.125"
  • Length: 1.5"
  • Width: 0.625"
  • Weight: 0.56oz w/ hardware
  • Material: 6061 Billet Aluminum
  • Finish: Type 03 Hardcoat Anodizing
  • Color: Carbon Black®, Terra Bronze®
  • Hardware: US Made 416 Stainless M-LOK Nut
  • Fastener: US Made T20 Torx Fastener w/ Nylon Thread Patch



© 2024 RailScales LLC All rights reserved. RailScales®, Karve®, XOS-H®, Carbon Black®, Terra Bronze® are registered trademarks of RailScales LLC.

For all patents and trademarks, see


(96 reviews) Write a Review

96 Reviews Hide Reviews Show Reviews

  • 5
    Karve control

    Posted by Aaron Cook on Mar 20th 2024

    Really like the simplicity and functionality of the Karve control.

  • 5

    Posted by Ashby moore on Mar 10th 2024

    Quality is truly unmatched when it comes to RailScales. No doubt that I will be buying again in the future.

  • 4
    Smaller than anticipated

    Posted by Andy on Nov 22nd 2023

    It was quite a bit smaller than what I envisioned. It will still be useful, but had to rethink its position. It would have been nice to have some instruction for the mounting system that is both MLok and KeyMod compatible. It would have been more useful for the QR code on the box to take me to the instructions rather than the page where I bought it from. Once I figured out I was stupid through the video everything went great. Looks good, fits good, feels good. The trifecta

  • 4
    Would love to see one change

    Posted by Jack Previte on Oct 5th 2023

    In general, i really like the Karve. The shape, quality, texturing is all top notch. If i could ask for one thing, it would be a second option that's scaled to 150% of its original size - something that would compete with the Emissary handbrake in terms of the way it would enable you to grip your handguard. The karve creates a great back stop for C-clamp style grips, but I'd love to be able to get 2-3 fingers up against it for added purchase. The Anchor and RSB are just a little too long/blocky for me; i like the styling of the karve, just need an inch and a half to 1.75" of surface area to grip against.

  • 4

    Posted by Scott on Sep 10th 2023

    Quality finger stop/ hand control product. Very solid.

  • 5
    2nd Karve

    Posted by Jeff Engel on Aug 26th 2023

    I have two Karves on my DDM4v7. They're exceptional as forward and rear hand stops. Paired with Rail Scale G10 XOH-Hs that wrap around my hand guard, I can't think of a better solution that compliments the functionality and appearance of my weapon.

  • 5
    Karve- Incredible Quality

    Posted by Jeff Engel on May 12th 2023

    I just installed the KARVE hand stop on my DDM4v7. It's absolutely the best hand stop i've used. Great ergonomics. Perfectly manufactured. Looking forward to more Rail Scales products on my other rifles.

  • 5
    Effing Awesome

    Posted by 2A-PEW-PEW-PAPA on Apr 29th 2023

    I love these little bastards!

  • 5
    Great product!

    Posted by Jose Martin Villegas on Apr 28th 2023

    Allows for positive control of the weapon while still being compact and lightweight