TandemKross Challenger Bolt Knob – Black

The TandemKross Challenger bolt knob (brand part no. TK42N0580BLK1) is an oversized, drop-in replacement handle finished in black, built to give rimfire shooters a faster, more positive grip when working the bolt. TandemKross built its name on rimfire competition parts, and the Challenger knob follows that same formula, replacing a small factory bolt handle with a larger surface that’s easier to find and manipulate under time pressure. Competitive shooters running speed-focused rimfire disciplines benefit most, but any shooter who wants a more confident bolt stroke will notice the difference. Installation is a straightforward swap of the factory handle for the Challenger knob.

Key Specifications

• Oversized bolt knob design replaces the factory handle for a larger, easier grip surface.
• Finished in black to blend with most rimfire builds.
• Built by TandemKross, a brand focused on rimfire competition performance parts.
• Drop-in installation swaps directly onto the factory bolt handle without permanent modification.
• Improves speed and confidence when cycling the bolt under time pressure.

Frequently Asked Questions

Does this require gunsmithing to install? No, it’s a drop-in replacement for the factory bolt handle.

Who benefits most from an oversized bolt knob? Competitive rimfire shooters who need a faster, more positive bolt stroke, though any shooter can appreciate the larger grip surface.

What color is this knob? This version is finished in black.

Buy the TandemKross Challenger Bolt Knob

Speed up your bolt stroke with a larger, more positive handle. Order the TANDEM KROSS Challenger bolt knob from our gun accessories lineup, and our Lubbock, Texas team can help confirm compatibility before it ships.