Cornerstone Safety Thumb Ledge for Ruger® Mark IV 22/45


$49.99 - $54.99
(77 reviews) Write a Review
0.30 LBS
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TANDEMKROSS Ruger MK4™ 22/45™ "Cornerstone" Thumb Ledge Installation Instructions

At a glance:

  • Oversized, 1911-style safety ledge
  • Enhances factory safety
  • Improves hand placement for better grip, control

Whether you’re a competitive shooter working to improve your speed and accuracy or a weekend plinker looking for better control over your pistol, a strong, proper grip is key. The new "Cornerstone" Safety Thumb Ledge for Ruger® MKIV™ 22/45™ from TANDEMKROSS is the ideal upgrade to boost your control!


The oversized, 1911-style safety ledge, made from anodized aluminum, enhances the external factory safety, without modifying the internals of the safety mechanism. This drop-in part is easy to install and does not change the internal components of the gun. Installation of the "Cornerstone" Safety Thumb Ledge for Ruger® MKIV™ 22/45™is also a great opportunity to remove the factory ambidextrous safety, which can pinch some users' fingers while shooting.

The Ruger® MKIV™  22/45™ aluminum safety ledge offers an ideal thumb placement for a secure grip and provides consistent hand positioning and helps to control muzzle flip. This is one of the best Ruger® MKIV™  22/45™  accessories for competition shooters. Get your "Cornerstone" today and lay the foundation for a better grip!

Please note: The "Cornerstone" installation utilizes a factory spacer included in your original box. This part is referenced on Page 23 of the original Ruger® manual. If you cannot located this spacer, please contact TANDEMKROSS or Ruger® and we can assist you with locating one.

Supported Models:

  • Ruger® MKIV™  22/45™ 
  • Ruger® MKIV™  22/45 Tactical™ 
  • Ruger® MKIV™  22/45 LITE™ 


Don't forget, all TANDEMKROSS products are Made in the USA and come with a LIFETIME guarantee!


WARNING: This product can expose you to chemicals including chromium, which is known to the State of California to cause cancer. For more information go to

77 Reviews

  • 5
    Great extra

    Posted by on 3rd Aug 2023

    Can't believe I ever went with out one

  • 5

    Posted by TM on 21st Jul 2023

    Have purchased several Tandemkross products and find them well made and good value. Had a bit of a problem with the cornerstone.. It happens.. Tandemkross quickly resolved the issue. Excellent products that they support with professionalism. I m a fan.

  • 5
    Very comfortable

    Posted by Torkil on 11th Jul 2023

    Big upgrade from the stock safety lever which dug into my hand while shooting

  • 5
    Great Addition

    Posted by Ray Stroup on 5th Nov 2022

    Purchased and installed the Cornerstone safety. Video was succinct and easy to follow. (BTW, Bill is great in the videos.) Great replacement for factory safety. Functions as expected, as all Tandem Ruger parts. Gloss black finish is fine. Only wish is that would be available in flat or parkerized black.

  • 5
    Safety Thumb Ledge

    Posted by Jody on 9th Aug 2022

    If you want more stability on such a light handgun, this mod along with the thumb rest is a huge improvement.

  • 5

    Posted by Albert on 3rd Aug 2022

    Puts the weapon on point always. Comfortable to shoot. Tecommended to friends with similar pistol

  • 5
    Cornerstone for 22/45

    Posted by Nicholas Brocato on 8th Jun 2022

    This is a must have addition to your Ruger 22/45. I had a problem with nudging the safety up with my thumb and the Cornerstone remedied this as well as providing a stable location for the thumb. if you shoot steel get one. Fit and finish is superb and installation is easy.

  • 5
    Very Nice!

    Posted by Gingy Beard on 30th Apr 2022

    Love the extension. Feels very comfortable while shooting

  • 5
    Thumb safety

    Posted by Charlie Rollins on 25th Apr 2022

    I very much like the concept (all my 1911s have larger thumb safeties). Even with my thumb riding the Cornerstone safety, it has a tendency to flip on in the middle of a course of fire. This seems to be some combination of where the safety contacts the base of my thumb and the recoil. I talked with another shooter who had the same problem but I m not sure how to fix it. Doesn t happen with the stock safety.