Ruger Mark IV Target 22 LR 10 Bull Barrel

About this product

The Ruger Mark IV Target is a semi-automatic .22 LR pistol built around a 5.5-inch bull barrel and Ruger's one-button takedown system — the biggest usability change Ruger made to the Mark platform after five decades of the old push-pin, loop-style takedown on the Mark I through III. It's a 10-round rimfire target pistol aimed at range shooters, new shooters learning trigger fundamentals, and anyone tuning up between centerfire sessions. This example ships new in box in a matte black finish, MPN 40187.

What is the Mark IV Target used for?

It's built for slow-fire bullseye work, plinking, and teaching new shooters fundamentals with minimal recoil and cheap ammunition. The heavy bull barrel adds forward weight that helps steady the sight picture, which is exactly what a target pistol is supposed to do. It's also a common choice for shooters keeping their trigger control sharp between more expensive centerfire range trips. The low cost of .22 LR ammunition means you can put a lot more rounds downrange per range trip than a centerfire caliber allows on the same budget.

How does the Mark IV compare to the older Mark III?

The one-button takedown is the headline difference — the Mark III required a pin punch, patience, and usually a YouTube video the first few times, while the Mark IV field-strips with a single button on the back of the frame. The trigger and internals were also refined for the Mark IV generation. Magazines are largely compatible across recent Mark-series pistols, but always confirm fit with your specific model before assuming interchangeability.

What fits it?

It runs standard .22 LR ammunition — bulk-pack is fine for plinking, while higher-quality target ammo will tighten up your groups at distance. Many Mark IV Target models are grooved or drilled for a scope base, though you should confirm this specific listing has that feature before ordering optics. The adjustable rear sight typical of Target-configuration Mark IVs lets you dial in windage and elevation for serious bullseye work.

Who is this not for?

It's not a concealed-carry gun — a 5.5-inch bull barrel target pistol has no ambitions toward a holster. It's also worth confirming the exact grip-frame style before buying if that detail matters to you, since Ruger sells this general platform with more than one grip-frame profile across its Mark IV lineup.

Does it work in California?

Ruger has kept a number of Mark IV configurations on California's handgun roster over the years, and the fixed 10-round capacity keeps this listing compliant with state magazine law without needing a separate compliant magazine hunt. Confirm current roster status for this exact model before ordering, and see our California gun laws page for the standard licensed-FFL, 10-day wait, DROS, and Firearm Safety Certificate process that applies to any handgun purchase.

Is it worth buying new in box?

The Mark IV's redesigned internals don't interchange cleanly with parts from the Mark I through III, so buying new avoids the used-parts mismatch headaches that come up on the secondary market. New-in-box condition also means you're not inheriting someone else's wear on a barrel this precise. For a dedicated .22 target gun, starting clean is worth the modest premium over a used example, especially since a bull barrel's accuracy is exactly the thing you don't want compromised by a prior owner's cleaning habits or storage.