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

"Cornerstone" Safety Thumb Ledge for Ruger® MKIV™

Part Number:TK32N0346

9 Review(s)

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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 "Corner Stone" 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 www.P65Warnings.ca.gov.

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Cornerstone Saftey

The Cornerstone thumb ledge solves a major problem of accidentally engaging the safety on the MK IV.

Did you find this helpful? 5 of 5 Found Helpful

Reviewed by: Tom Sigmon from USA. on 9/22/2019

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 5 Found Helpful

Reviewed by: (Verified Buyer) Paul Sun from Riverside. on 8/3/2019

Safety Thumb

Bought the Safety Thumb in Red & it looks & feels good in hand. Will be test shooting very soon so I can't give a update on that just yet. Otherwise, very pleased with this item on my weapon the Mark IV Tactical

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Reviewed by: Isaac Miles from Texas. on 6/2/2021

heads up on install

Instructional video was good, thumb ledge safety is perfect, and I certainly needed to remove the right-hand safety, but one thing that should be in the video: Immediately after removing the right-hand grip, take out the magazine assist, the safety spring and the plunger. These are at the bottom of the grip frame. If you don't, they surely will go "boing," as mine did, to my surprise. Two of the pieces ended up on my rug -- 10 minutes to find them.

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Reviewed by: (Verified Buyer) Evan Jones from Bellingham, WA. on 3/1/2021

cornerstone safety

EXCELLENT EXCELLENT CUSTOMER SERVICE! The safety is very easy to install IF you take your time not to disturb any of the internals. the safety is easy out and back in if you use a follower or long punch. Works perfectly. installed on both of my HABU's.

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Reviewed by: Richard from Arizona. on 9/16/2020