CSMR® Button

(24 reviews) Write a Review

Product Overview

CSMR® Button - Concentric Spring Magazine Release button for M4/AR style rifles. The CSMR® features two bosses on the backside to help keep the spring concentric during compression, and a raked 8 degree face for a more natural finger placement. Keeping the spring concentric during compression helps eliminate the crunchy feel when depressing. Offered in two styles, "MilSpec" (visually looks like the MilSpec fingerprint with all the updated features of the CSMR®) or "Apex" (a mild yet grippy texture) to accomodate both the agressive or more conservative style of AR's. Also included is one of our 302 Stainless Mag Catch Springs (also available separately for purchase here) for even smoother compression, Patent Pending. Only includes the Button and Spring.

Ships Free and Made in USA 

  • CNC Machined 
  • 6061-T6 Aluminum
  • Type 03 Hardcoat Anodizing
  • 8 Degree raked face
  • Two button Styles to choose from
  • 302 Stainless spring included
  • Less than 0.01oz (including spring)


(24 reviews) Write a Review

24 Reviews Hide Reviews Show Reviews

  • 5

    Posted by Corey Starr on May 31st 2023

    Being able to source parts from a local and quality manufacture is the best. The texture of the Apex feels great while letting you know "that's the mag release" for sure. The 302 spring doesn't feel weak or over stiff. Making for a great experience all around.

  • 5
    CSMR button

    Posted by Cooper on Feb 26th 2023

    The CSMR button is a great add. I’ve bought them for every AR and MCX in the safe. I’m a princess and I hate shooting rifles without CSMRs now.. thanks RailScales for making a product that I can’t shoot without.

  • 5
    Terra Bronze MilSpec CSMR Button

    Posted by Nick on Dec 21st 2022

    Looks and feels good. Color matches well with Radian Brown

  • 5

    Posted by Tito on Nov 18th 2022

    What sweet button, feels fine. Nothing too jagged when I'm not wearing gloves. But we all know looking good is half the battle and this d**n thing looks gooood. I love how the terra bronze fits with the anodized green lower.

  • 5
    Excellent Product

    Posted by Gary on Sep 15th 2022

    Great packaging, great product and fast shipping!

  • 5
    csmr button

    Posted by sevastian on Aug 16th 2022

    very nice and sturdy construction definitely feel a diffrence in function. easy to press end release magazine.

  • 5
    It’s hawt

    Posted by Z Steezy on Apr 26th 2022

    I bought one, then I bought two….then I bought three. I’m not saying it will fix any problems you have in your marriage or make your kids love you again. But it will potentially make your mag changes way more betterer if you’re into that kind of thing, and will definitely make you the aesthetic gawd at your favorite indoor range. Which in turn will most certainly cause the gun bunnies to come after you so in the end it’s really not a big deal that your marriage wasn’t saved. And you can trust me on all of this because I only shoot flat range.

  • 4
    Extremely nice product with one minor installation issue

    Posted by Michael Anderson on Mar 1st 2022

    The machining is perfect, the anodizing is tough and beautiful. The included spring is strong. The only reason I'm giving this four stars is because of the two bottom extensions that help keep the spring centered on the button. They are helpful for installation and consistent mag release pressure, but they really didn't need to be so long. They were long enough that they prevented me from depressing the button deep enough to fully thread on the mag catch while still clearing my FCD bolt catch. I ended up using a steel file to remove material from the nubs, so I didn't have to remove my bolt catch just to install a mag release. A minor annoyance, but an annoyance nonetheless on a 22 dollar mag button. The button would be perfect if the spring support nubs were half as long as they are.

  • 5

    Posted by travis on Jan 31st 2022

    can't say that it works better than a standard mag release button, but the finish is flawless and it looks great with the other tano pieces.