Cornerstone Safety Thumb Ledge for Ruger® Mark IV™
"Cornerstone" Safety Thumb Ledge for Ruger® MKIV™ front view in black by Tandemkross

Cornerstone Safety Thumb Ledge for Ruger® Mark IV™

Part Number:TK24N0346
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Your Price: $49.99
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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 from TANDEMKROSS is the ideal upgrade to boost your control!

Now available for the MKIV™, the oversized, 1911-style Safety Thumb 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™ is also a great opportunity to remove the factory ambidextrous safety, which can pinch some users' fingers while shooting.

The aluminum Cornerstone 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™ accessories for competition shooters. Get your Cornerstone Safety Thumb Ledge 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 locate this spacer, please contact TANDEMKROSS or Ruger® and we can assist you with locating one.

Supported Models:

  • Ruger® MKIV™ Standard

  • Ruger® MKIV™ Target

  • Ruger® MKIV™ Hunter

  • Ruger® MKIV™ Competition

  • Ruger® MKIV™ Tactical

Please note: Some modification of the grips may be required for proper fit on Hunter and Target models that use the target wraparound wood laminate grips with finger grooves.

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
5 Stars
Cornerstone Saftey
The Cornerstone thumb ledge solves a major problem of accidentally engaging the safety on the MK IV.
Did you find this helpful?  8 of 8 Found Helpful
Reviewed by:  from USA. on 9/22/2019
5 Stars
Excellent fit and finish
I have been waiting for the MK4 SS version for some time. It fits my hunter perfectly. Same smooth durable finish as halo ring. Excellent product!
Did you find this helpful?  5 of 6 Found Helpful
Reviewed by: (Verified Buyer)  from Riverside. on 8/3/2019
5 Stars
Cornerstone for Mark IV
Great product. My second one. I highly recommend Cornerstone to anyone who owns and shoots a Mark IV, 22/45 or steel frame. Installation is not complicated, follow Bill's video closely.
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from Texas. on 11/18/2022
5 Stars
Easy install
The Thumb Rest and Safety Thumb Ledge were easy to install. My Ruger Mark IV 22/45 Target now compliments my CZ Shadow 2 for shooting Steel Challenge.
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by:  from Colorado. on 10/18/2021
5 Stars
Thumb ledge Ruger mark IV
Big improvement to the manufactures safety
Did you find this helpful? 
Reviewed by:  from Denver . on 10/3/2023

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