CSMR™ Button

(9 reviews) Write a Review

Product Overview

CSMR Button™ - Concentric Spring Magazine Release button for M4 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)


(9 reviews) Write a Review

9 Reviews Hide Reviews Show Reviews

  • 5
    Nice upgrade

    Posted by brett mariotte on Jul 15th 2021

    This was a nice upgrade for my rifle. I like the product and the color.

  • 5

    Posted by Tyson Purchatzke on Jan 20th 2021

    Nice little upgrade! Great ergos and looks awesome against my tan lower!

  • 5
    Awesome product!

    Posted by Neal on Jan 11th 2021

    Super high quality. Fits like a glove. I really like how it is cut out to fit the spring. Its just the small things that really make this product awesome. The texture of the button is great too. Highly recommended.

  • 5
    Super high quality

    Posted by Jake Spencer on Aug 26th 2020

    I recently purchased this magazine release for a build that i am putting nothing but the absolute best parts on. Needless to say it fits the bill perfectly. There aren’t a whole lot of options on the market to upgrade the magazine release with better than mil-spec parts so when I found this product I was super stoked to try it out. I’m so glad that I did and can’t recommend it enough!

  • 5
    How great can it be?

    Posted by Reece on Jul 30th 2020

    That was my exact thought, I’m very happy to say it’s worth every single penny, it’s on all of my ar’s it is absolutely worth it. I don’t know why you’d chose anything else

  • 5
    Simple but often over looked part

    Posted by Colin on Jun 22nd 2020

    Mag release buttons are probably the most simple part on an AR platform and because of that they’re often over looked. Yet we used them constantly when using our ARs. The CSMR Button is simple but a nice addition. Good feel and smooth operating!

  • 4

    Posted by JP on Jan 28th 2020

    Nicely constructed and finished. Lets you screw down the release a little deeper than stock, the angle is also a nice touch. The spring does not make much of a difference though. Good product overall.

  • 5
    Simple but perfect!

    Posted by Seth on Jan 26th 2020

    you wouldn’t think this would make such a big difference but it actually does. I picked up the Apex design and love it. Very grippy and smooth at the same time! Not to mention it looks awesome and adds a little bit of detail to an otherwise boring part. Great job!

  • 5
    Like a Glove!

    Posted by Gary M. on Jan 21st 2020

    I never thought that a mag button would make a difference, but this one really does. It is so smooth and consistent every time. Great job designing this thing Railscales.