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Product Overview

Now shipping with our new custom Torx T20 fasteners!

RSB® Vertical Grip - A fully machined ultralight stubby aluminum grip. Designed for PDW and shorter barrel setups but its ergonomics also find itself at home on carbines as well. The cylinder of the grip is offset 0.140" to allow for fine adjustment in its already small footprint by alternating its direction. When used as a broom handle style grip, the RSB allows for a 3 fingered grip with the pinky over hanging the bottom. 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 Scales, making the RSB 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: 2.488"
  • Length: 1.57"
  • Width: 1.18"
  • Outside Diameter: 1.42"
  • Weight: 1.92oz w/ hardware
  • Material: 6061-T6 Aluminum
  • Finish: Type 03 Hardcoat Anodizing
  • Color: Carbon Black®, Terra Bronze®
  • Hardware: US Made 416 Stainless M-LOK Nuts
  • Fastener: US Made T20 Torx Fasteners w/ Nylon Thread Patch



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

For all patents and trademarks, see


(41 reviews) Write a Review

41 Reviews Hide Reviews Show Reviews

  • 5

    Posted by Byron D. on Feb 3rd 2024

    I was able to catch the RSB while it was in stock. I threw it on my Q Sugar Weasel Recce build and it’s a perfect addition to my accessories so far. It seats very sturdy and provides a more comfortable hand position when holding for extended periods. I’ll definitely be grabbing an FDE version soon. Super light weight and durable. Also adds a touch of prestige.

  • 5
    Perfect for handguards with a single mlok slot

    Posted by Tyler Frogley on Jul 16th 2023

    When I was scouring the internet for an mlok vfg I noticed most polymer ones have extensions that index into a front and rear mlok slot. I chose this one because it appeared to fit in a single mlok slot allowing for other mlok real estate to be utilized for other purposes. I could see this being perfect for an SBR build where minimal mlok slots are available. It’s also dual use for dikmod and mlok which I had no idea but it’s at least good to know if I ever migrated. It’s also pretty comfortable and not excessively long IMO.

  • 4
    Great, but overly expensive.

    Posted by Eli on May 11th 2023

    Great product, very well made, great feel. But overly expensive for a piece of milled aluminum.

  • 5

    Posted by David Sweet on May 4th 2023

    Best vertical grip I’ve ever felt. It is perfect. Replaced my Anchor with this.

  • 5
    I "Need" More Of These!

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

    These foregrips are Phenomenally KickAss!

  • 5
    sweet vertical boi

    Posted by Andyroo on Sep 15th 2022

    railscales is a awesome company I buy from them all the time. the grip fits my hand great. and the finish is awesome. worth the money

  • 5
    Best vertical grip out there

    Posted by Kyle on Sep 9th 2022

    I love these grips . All of them !

  • 5
    RBS Second to None

    Posted by Fabian Cruz on Jun 28th 2022

    The RSB is lightweight and sturdy. Everything from Railscales is top notch. My go to for all their accessories for my rifles.

  • 5

    Posted by Rex on May 9th 2022

    Big fan of the quality and ability to apply to both Keymod and mlok. Solid build. The price tag is the only downside.