TandemKross Mark IV Parts · 22/45 Upgrades · 10/22 Parts
TandemKross builds some of the most popular upgrades for rimfire pistols and rifles, from Krossfire bolts and Victory triggers to HiveGrips and Halo charging rings. As an authorized TandemKross dealer, we carry bolts, triggers and kits, grips and controls for the Ruger Mark IV, 22/45, 10/22, SW22 Victory and Buck Mark.
Shop All TandemKrossShop TandemKross by Product
Bolts, triggers, grips and controls.
Bolts & Charging
Krossfire bolts for the Mark IV and 22/45 and Halo charging rings for a positive grip.
Shop TK BoltsTriggers & Kits
Victory triggers, the Race Speed Kit and KrossPins for a crisper Mark IV and 10/22.
Shop TK TriggersGrips & Ergonomics
HiveGrips, the Get a Grip Kit and titanium grip screws for the Mark IV, 22/45 and SW22.
Shop TK GripsControls
Titan extended magazine releases, Bolt Keeper bolt stops and MarkPRO magazine bumpers.
Shop TK Controls10/22 Upgrades
The Spitfire lightweight barrel, Fireswitch magazine release, Spartan charging handle and KrossPins.
Shop TK 10/22Buck Mark Upgrades
The GearBox upgraded sear spring for a lighter, cleaner Buck Mark pull.
Shop TK Buck MarkFind your TandemKross.
TandemKross parts are made for specific rimfire platforms. Pick yours, then confirm fitment on the product page.
Shop by TandemKross Line
The TandemKross parts shooters ask for most.
Upgrade the Build
Kits, triggers and optics for a faster rimfire.
Accessories & Gear
Holsters, magazines and mounting.
The Complete Rimfire Pistol Upgrade
TandemKross makes nearly every control on the Mark IV better: the bolt, the trigger, the grips, the mag release and the bolt stop. Combine them with a Volquartsen accurizing kit and a red dot and you have a competition-ready pistol built from the parts serious rimfire shooters run.
Building With TandemKross
Start with the controls
A Titan mag release, a Bolt Keeper and a Halo charging ring are quick installs that make the Mark IV faster and easier to run.
Then the trigger and bolt
A Victory trigger or the Race Speed Kit improves the feel of the pull, and a Krossfire bolt adds precise, positive lockup.
Fit it to your hand
HiveGrips and the Get a Grip Kit add texture and control without adding bulk.
10/22 too
For the 10/22, TandemKross offers the Spitfire lightweight barrel, the Fireswitch magazine release and Spartan charging handles.
TandemKross FAQ
Will TandemKross parts fit both the Mark IV and the 22/45?
Many TandemKross Mark IV parts are listed for both the Mark IV and 22/45, and some fit the 22/45 Lite. Check the fitment notes on each listing.
What is the Race Speed Kit?
The Race Speed Kit bundles TandemKross upgrades for the Mark IV and 22/45, including a Halo charging ring, trigger and base pad, for faster, more consistent shooting.
Do I need a gunsmith to install TandemKross parts?
Most TandemKross parts install at home with basic tools and the included instructions. Always function check the firearm after installing fire control parts.
TandemKross or Volquartsen for my Mark IV?
Many shooters run both. Volquartsen accurizing kits focus on the fire control group, while TandemKross covers the bolt, controls and grips. They work well together.
Keep Building
More from the bench.
Accurizing Kits
Volquartsen and TandemKross kits for the Mark IV and 22/45.
Shop Accurizing KitsPistol Triggers
Volquartsen, TandemKross, Apex and Timney pistol triggers.
Shop Pistol TriggersRed Dot Sights
Holosun, Trijicon, Vortex and Aimpoint dots for pistols and carbines.
Shop Red DotsShop All Brands
Every manufacturer we carry in one place, from MDT and Volquartsen to our own USA-made parts.
Browse Brands