What do you reach for when the squirrels are moving through the hardwoods at first light, the rimfire target is at 50 yards, or you want a .22 pistol worth shooting for more than ten minutes before your hand gets tired? If the answer isn’t a Ruger Mark IV yet, it probably should be. The Ruger Mark IV 22/45 Lite Diamond Grey is the benchmark American .22 LR semi-auto pistol — and at $512.10 it earns that title.
Here’s the full breakdown.
Understand What Makes the Mark IV Different
The Ruger Mark lineage runs back to 1949 — the first commercially successful American rimfire semi-auto, designed by Bill Ruger himself. The Mark IV is the current generation. The headline feature: one-button takedown. Press the button on the back of the frame and the barrel-receiver assembly tilts up and off the grip frame in seconds. Field-strip properly, clean chamber to muzzle, reassemble without the frustration that made the Mark II and Mark III infamous on gun forums. The 22/45 variant uses a polymer grip frame angled to match the 1911’s 45-degree geometry — the most natural pointing angle for most trained shooters. If you carry a 1911 or any similarly angled pistol, the 22/45 points the same way your carry gun does. The Lite designation means a threaded aluminum bull barrel sleeve — lighter than stainless bull barrel, with accuracy advantages of a bull profile, and a 1/2×28 threaded muzzle suppressor-ready out of the box.
Full Specifications
| Spec | Detail |
|---|---|
| SKU | 43921 |
| Caliber | .22 LR |
| Action | Semi-auto, single-action |
| Barrel | 4.4 in, threaded 1/2×28, aluminum sleeve |
| OAL | 8.5 inches |
| Weight | 25.5 oz |
| Capacity | 10+1 |
| Frame | Polymer 22/45 (1911 grip angle) |
| Finish | Diamond Grey anodized |
| Sights | Fiber optic front, adjustable rear |
| Optics | Drilled and tapped |
| Made In | USA (Prescott, AZ) |
| Price | $512.10 |
Run It Suppressed From Day One
The 1/2×28 threaded barrel sleeve is standard equipment — not an upgrade, not a separate configuration. Pair it with any .22 LR suppressor and you have one of the quietest, most pleasant shooting experiences available for under $600 in pistol cost. Subsonic .22 LR through a suppressed Mark IV 22/45 Lite is hearing safe without earpro in most configurations. For pest control on a working property or a training setup that won’t disturb the neighbors, the combination is hard to beat. The Silencerco Omega 9K at $636.65 handles 9mm and .22 LR with the right adapter for shooters building a multi-caliber suppressor.
The Single-Action Trigger: A Real Training Advantage
The Mark IV single-action trigger breaks from a pre-cocked hammer on every shot — same clean, short break every pull. Factory pull runs 3-4 lbs with a positive reset. For precision rimfire at 50 yards, punching paper or teaching a new shooter to call their shots, it’s one of the best teaching tools in the price class. You can feel exactly when the shot breaks. You can learn exactly what you’re doing wrong when it doesn’t land where you aimed. I’ve watched instructors run new shooters on the Mark IV for the first two hours of a handgun course before transitioning to centerfire — the reduced recoil and clear fiber optic feedback accelerates fundamentals faster than starting with a full-power gun does.
Who the Ruger Mark IV 22/45 Lite Is Built For
High-Volume Trainers Who Can’t Afford to Feed Centerfire All Day
A thousand rounds of .22 LR costs what 150 rounds of 9mm costs. If you shoot regularly, a quality .22 trainer cuts your annual ammo bill substantially while keeping fundamentals sharp. The 22/45 grip angle matching a 1911 makes it a genuine practice tool, not a separate manual of arms to learn.
Hunters and Farm Pest Control
A suppressed .22 pistol is one of the most practical pest control tools on a working property. Squirrels in the corn crib, starlings on the barn, rabbits in the garden — the Mark IV 22/45 Lite handles it with minimal noise and minimal meat damage. At 25.5 oz with a short barrel, it rides in a field holster for all-day work without the weight of a serious centerfire on your hip.
Collectors Who Shoot Their Collection
The Diamond Grey anodized finish stands apart in a safe or on a shelf. The aluminum sleeve takes anodizing cleanly and evenly — the Diamond Grey looks better in person than in photos. For a Ruger collection or anyone who wants a Mark IV that doesn’t look like every other one in the display case, SKU 43921 earns its place.
Mark IV 22/45 Lite vs. The Competition
| Model | Price | Trigger | Threaded | Takedown |
|---|---|---|---|---|
| Ruger Mark IV 22/45 Lite | $512.10 | SA 3-4 lbs | Yes 1/2×28 | One-button |
| CZ 457 Pro Varmint (rifle) | $479.99 | SA adjustable | Yes | Standard |
| Ruger 10/22 Carbine (rifle) | $269.99 | Standard | No | Standard |
| S&W SW22 Victory | ~$480 | SA 3.5 lbs | Optional | Tool-free |
Closest comparison is the S&W SW22 Victory. The Mark IV beats it on trigger feel and the factory threaded barrel included as standard. The CZ 457 and Ruger 10/22 are excellent rimfire platforms but they’re rifles — different role.
Frequently Asked Questions
Is the Ruger Mark IV 22/45 Lite worth the price premium over basic .22 pistols?
Yes, for regular shooters. The factory threaded barrel, single-action trigger, 1911-angle grip frame, and one-button takedown add genuine value over basic .22 pistols at $200-$300. The Mark IV earns its price difference through every range session for anyone who shoots consistently.
What suppressor fits the 1/2×28 threaded barrel?
Any .22 LR suppressor with a 1/2×28 thread — which is virtually every US .22 can on the market. Gemtech GM-22, Ruger Silent-SR, SilencerCo Sparrow are popular choices. No adapters needed. For multi-caliber suppressor use, many 9mm cans accept a .22 LR piston adapter.
What .22 LR ammo runs best?
Standard and high-velocity loads function reliably. For suppressed use, subsonic loads (CCI Standard Velocity, Federal Champion) keep the action below the sound barrier. Remington Golden Bullet has a mixed reputation in the Mark IV community — verify your preferred load with a test box before relying on it.
Is it California compliant?
Some Mark IV configurations are on the California Handgun Roster. Verify SKU 43921’s current roster status with the California DOJ or your local FFL before purchasing.
The Verdict
The Ruger Mark IV 22/45 Lite Diamond Grey is the best value in American-made .22 LR semi-auto pistols at its price point. Factory threaded barrel, single-action trigger, 1911 grip angle, and the most user-friendly takedown in its class. At $512.10, it’s a buy for hunters, trainers, collectors, and anyone who wants a quality rimfire pistol built to run for decades.
Order the Ruger Mark IV 22/45 Lite — $512.10
Related: Ruger 10/22 — $269.99 | CZ 457 Pro Varmint — $479.99 | Ruger 10/22 2026 — $389.00 | Ruger SFAR M81 — $1,068.99
Published: March 1, 2026.