TANDEMKROSS Accelerator Forward Thumb Ledge for Ruger Mark IV 22/45

The TANDEMKROSS Accelerator Forward Thumb Ledge for Ruger Mark IV 22/45 (TANDEMKROSS part no. TK26N0535BLK1) is a grip accessory, not a control lever, designed to give shooters a dedicated resting point for their support-hand thumb. Rather than functioning as a magazine release or slide catch, it simply adds a raised, textured ledge to the frame that shooters can brace their thumb against for a steadier, more consistent grip shot to shot. That extra contact point helps tame muzzle rise and recoil, which pays off directly in faster, more accurate follow-up shots during rapid-fire strings. It’s built specifically for the Ruger Mark IV 22/45 platform, fitting both the factory lower and TANDEMKROSS‘s own Cthulhu Lower without any permanent modification to the pistol. For rimfire shooters running speed drills, steel challenge, or just plinking with better control, it’s a simple upgrade that changes how the gun sits in the hand.

Key Specifications

• Functions as a thumb rest/ledge, giving the support hand a dedicated point of contact rather than acting as any kind of lever or release.
• Fits the Ruger Mark IV 22/45 factory lower without permanent modification.
• Also compatible with the Cthulhu Lower for shooters running that upgrade.
• Uses a non-permanent, pin-based installation that doesn’t require gunsmithing.
• Textured with a scalloped surface to keep the thumb from slipping under recoil.
• Finished in black to match a factory-finish Mark IV 22/45.
• Covered by a lifetime guarantee against mechanical failure.

Frequently Asked Questions

Is this a magazine release or slide catch? No. It’s strictly a grip accessory, a thumb ledge that gives you a stable resting point, not a functional control.

Will this fit my factory Ruger Mark IV 22/45? Yes, it installs on the factory lower as well as the Cthulhu Lower.

Will my holster still fit with this installed? Not always. The added ledge can interfere with a snug factory holster, so a modified or custom holster may be needed.

Buy the TANDEMKROSS Accelerator Forward Thumb Ledge

Small changes in how a pistol sits in your hand add up fast when you’re chasing faster splits and tighter groups, and this thumb ledge is one of the easiest upgrades to feel on your very first magazine. It’s a simple bolt-on that rewards good grip fundamentals instead of replacing them. Order it from our handgun parts lineup for fast, direct shipping to your door.