VOLQUARTSEN | RUGER MARK IV TRIGGER UPGRADES
Flat Face. 90-Degree Break. Built for Speed.
The Volquartsen MK IV Accurizing Kit with Black 19.22 Flat Trigger is a complete drop-in fire-control upgrade for every Ruger MK IV, including the 22/45 and 22/45 Lite. Volquartsen promotes the 19.22 for a 1.75 lb design pull, a 90-degree break and a short, positive reset, with adjustable pretravel and overtravel. Made in USA.
The MK IV made takedown simple; Volquartsen makes the trigger exceptional. The Accurizing Kit replaces the factory fire-control parts with a matched set designed to work together: a target hammer, target sear, CNC-machined disconnector and the trigger itself. The 19.22 Flat Trigger takes it further: a straight trigger face gives your finger the same consistent placement on every press, the 90-degree break keeps the sights quiet through the shot, and the short reset gets you to the next target faster—exactly what Steel Challenge and rimfire speed shooters want.
A Complete Drop-In Trigger System.
Inside the kit you'll find the CNC-machined disconnector, target hammer, hammer bushing, target sear, and the black 19.22 Flat Trigger with trigger plunger and spring, plus Allen wrenches and medium-strength Loctite for the adjustment screws. Pretravel and overtravel let you refine the feel to your preference. Prefer a traditional curved trigger? The Black Target Trigger kit, Stainless Target Trigger kit and Gold Target Trigger kit offer Volquartsen's Target Trigger with a 2.25 lb design pull.
Pair It with a Volquartsen Competition Bolt.
A great trigger is only half the equation—the bolt does the rest of the work. The Volquartsen Black DLC Competition Bolt is the natural match for this black flat-trigger kit, and the Volquartsen Gold Competition Bolt offers the same design with a bold accent. Both are CNC-machined, ground and case hardened, drop into the MK IV, and arrive with an Exact Edge Extractor, SureStrike Firing Pin, recoil rod and three recoil springs for tuning to your ammunition. If you'd rather keep your factory bolt, the Bolt Tune-Up Kit adds the extractor and firing pin on their own.
Build Out Your MK IV.
Want the trigger and bolt upgrades in one box? Step up to a complete Competition Kit such as the MK IV Competition Kit with Gold 19.22 Flat Trigger or the MK IV Competition Kit with Gold Target Trigger. On 22/45 models, finish the controls with the Volquartsen Extended Bolt Release. Ruger owners also look at names like Tactical Solutions and TANDEMKROSS; for the trigger system itself, Volquartsen remains one of rimfire's most established choices. Browse everything in our Ruger Mark IV Parts & Upgrades Collection.
Pete's Pillars is an authorized Volquartsen dealer. We carry genuine Volquartsen upgrades for shooters who want their rimfire to feel as good at the firing line as it looks on the bench.
Product Specifications
Manufacturer: Volquartsen Firearms
Product: Accurizing Kit for Ruger MK IV
MPN: VC4AK-0004
Compatible Pistols: Ruger MK IV, MK IV 22/45 and MK IV 22/45 Lite (factory frames)
Trigger: Black 19.22 Flat Trigger
Designed Trigger Pull: 1.75 lb
Trigger Adjustments: Pretravel and Overtravel
Included: CNC-Machined Disconnector, Target Hammer, Hammer Bushing, Target Sear, 19.22 Flat Trigger with Plunger and Spring, Allen Wrenches, Medium-Strength Loctite
Magazine Disconnect: Eliminated by Installation
Manufactured: Made in USA
Frequently Asked Questions
What's included, trigger options, MK IV compatibility, and ordering genuine Volquartsen components.
What's included in the VC4AK-0004 Accurizing Kit?
A CNC-machined disconnector, target hammer, hammer bushing, target sear, and the black 19.22 Flat Trigger with trigger plunger and spring, plus Allen wrenches and medium-strength Loctite for the adjustment screws.
Will it fit my MK IV 22/45 or 22/45 Lite?
Yes. Volquartsen designed this kit for all Ruger MK IV variations, including the 22/45 and 22/45 Lite, with factory Ruger frames. Compatibility with aftermarket frames is not guaranteed.
What's the difference between the 19.22 Flat Trigger and the Target Trigger?
This kit uses the 19.22 Flat Trigger, which Volquartsen promotes for a 1.75 lb design pull, a flat face, a 90-degree break and a short reset. The curved Target Trigger, found in the VC4AK Accurizing Kit, is designed for a 2.25 lb pull. Choose the flat trigger for speed shooting and consistent finger placement.
Does it change the magazine disconnect?
Yes. Installing the kit eliminates the factory magazine disconnect, so the pistol can fire with the magazine removed. Everyone handling the pistol should understand that change. Follow Volquartsen's installation instructions and function-check the pistol before use.
Which Competition Bolt pairs with this kit?
What's the difference between the Accurizing Kit and the Competition Kit?
The Accurizing Kit covers the trigger and fire-control system. A Competition Kit adds the Bolt Tune-Up Kit—Exact Edge Extractor and SureStrike Firing Pin. See the MK IV Competition Kit for the complete package, or add the Bolt Tune-Up Kit separately.
Is Pete's Pillars an authorized Volquartsen dealer?
Yes. Pete's Pillars is an authorized Volquartsen dealer offering genuine Volquartsen Ruger Mark IV upgrades. We stock accurizing kits, competition kits and bolt upgrades so you can build your next precision rimfire project with confidence.
Small Change. Big Impact. Pete's Pillars.
