TANDEMKROSS Krossfire Bolt (Ruger Mark IV / 22/45)

The TANDEMKROSS Krossfire Bolt is a premium replacement bolt assembly for the Ruger Mark IV that drops reciprocating mass for faster cycling and lower felt recoil. EDM-machined steel construction throughout, with reduced cuts and lightening pockets that shave weight from the factory bolt while preserving the locking and feeding geometry. The result is a slide that returns to battery measurably faster, which translates directly to lower split times for competition shooters.

The improvement is real but incremental. A casual range shooter will not feel the difference; a Steel Challenge shooter chasing tenths between strings will. This is a deliberate-purchase upgrade for shooters who already own the Volquartsen Accurizing Kit and are looking for the next meaningful gain. Drop-in fit on every Mark IV variant including the 22/45, 22/45 Lite, 22/45 Tactical, and the steel-frame Target, Hunter, and Competition.

Available in black-on-black (TK26N0540BWB1) and black-with-red-halo (TK26N0540BWR1). Functionally identical, the halo is a cosmetic accent. Note that aftermarket bolts can complicate Ruger warranty discussions, so keep the factory bolt in case you need to send the pistol back. In stock at OpticsPlanet at the time of writing, $209.