Guide

Ruger Mark IV 22/45 Lite 43961 Review: Threaded 4.4" .22LR Trainer Built for Suppressed Range Time

Ruger Mark IV 22/45 Lite (Model 43961) .22LR 4.4" Threaded Pistol: Blue/Black Performance Trainer

Introduction

The Ruger Mark IV 22/45 Lite (Model 43961) is purpose-built for shooters who want a lightweight, accurate .22 LR pistol that still feels “serious” in the hand—ideal for high-volume range sessions, skill-building, and rimfire competition practice. This RSR Group distributor-exclusive variant pairs a blue anodized aluminum receiver with the familiar 22/45-style polymer grip frame (1911-ish grip angle), delivering a modern Mark-series experience with the standout Mark IV benefit: fast, tool-less takedown for cleaning.

If your search intent is a suppressor-ready rimfire handgun that stays comfortable through long strings of fire, the 4.40" threaded barrel and 25 oz overall weight are exactly what make this model such a strong fit for training, steel, and target work.

Key Features and Specifications

Below are the core specs and what they mean in practical terms for the shooter.

Core specifications (Model 43961)

  • Manufacturer / Series: Ruger Mark IV 22/45 Lite
  • Model number / MPN: 43961
  • UPC: 7-36676-43961-4
  • Caliber: .22 LR
  • Capacity: 10+1
  • Barrel length: 4.40 in (11.1 cm)
  • Barrel style: Threaded
  • Thread pattern: 1/2"-28
  • Overall length: 8.40 in (21.3 cm)
  • Weight: 25 oz (708 g)
  • Receiver material: Aluminum
  • Grip frame: Polymer
  • Sights: Fixed front / adjustable rear
  • Rifling: 6 grooves, 1:16" RH twist
  • Finish: Blue anodized (receiver)
  • State notes: Not listed as available in CA or MA (per Ruger listing)

What sets the Mark IV 22/45 Lite apart

  • One-button takedown: A major upgrade over older Mark-series field-stripping. Press the rear frame button, tilt the upper off, and you’re ready to clean from chamber-to-muzzle—especially helpful for rimfire fouling.
  • Suppressor/muzzle-device ready: The 1/2x28 threads are the common standard for rimfire suppressors and many .22 accessories. Ruger also notes the threaded barrel includes a thread protector on this family of pistols.
  • Lightweight “Lite” balance: At 25 oz, it’s easy to hold on target for extended practice, and it remains a comfortable understudy to larger defensive pistols.
  • Ergonomic 22/45 grip angle: The 22/45 format is popular for shooters who prefer a 1911-style grip angle and controls layout feel.

Finish and configuration notes (Blue/Black look)

Your provided product context describes an anodized blue appearance with black accents (barrel and trigger). Ruger’s spec sheet for Model 43961 calls out Blue Anodized finish and confirms the platform details above; accent colors and small-part finishes can vary by run/exclusive package, but the functional “what matters” pieces—threading, sights, length, weight, capacity—are clearly defined.

Practical Applications

1) Training that translates to centerfire pistols

Rimfire is where you can afford to put in reps. The Ruger Mark IV 22/45 Lite (Model 43961) shines as a skills-builder because it rewards fundamentals:

  • Trigger control and follow-through are obvious with .22 LR—bad inputs show on paper.
  • Sight tracking is easier than with centerfire recoil, so you can train cadence and transitions.
  • The 22/45 grip geometry helps many shooters maintain a more “service pistol-like” feel than classic Luger-style rimfire grips.

2) Suppressed range sessions and low-noise practice

With its 1/2x28 muzzle threads, this pistol is a natural host for a rimfire suppressor (where legal). Suppressed rimfire practice is valuable for:

  • Reduced blast and concussion (especially on indoor ranges)
  • More comfortable practice for newer shooters
  • Better coaching environment—less noise means more communication and faster learning

Important: Always confirm your suppressor’s thread spec and proper installation, and keep rimfire systems clean—.22 LR is dirty by nature.

3) Steel, plinking, and informal competition

The combination of adjustable rear sight, known Mark-series accuracy potential, and manageable weight makes it extremely fun on:

  • Rimfire steel plates
  • Small reactive targets
  • Club-level rimfire pistol matches

The adjustable rear sight is a real advantage if you switch loads (standard velocity vs. high velocity) or add a suppressor and want to fine-tune point of impact.

4) A practical “lifetime” .22 pistol for high round counts

Rimfire pistols often become the most-shot guns people own. Mark-series pistols have long been popular precisely because they hold up to volume. The Mark IV’s simplified disassembly also removes a huge barrier to routine maintenance—meaning owners are more likely to actually keep it clean and running.

Expert Analysis

Strengths

  • Easy maintenance is not a gimmick: Mark IV takedown is a meaningful quality-of-life feature for anyone shooting bulk .22.
  • Threaded 4.40" setup is the sweet spot: Long enough for good sight radius and velocity, short enough to stay handy—especially with a suppressor attached.
  • Weight and balance support long practice: The Lite configuration reduces fatigue and encourages more trigger time.

Considerations (so you buy with eyes open)

  • 10+1 capacity: Great for training and most range work, but if your primary goal is maximizing round count between reloads, you’ll want extra magazines on hand.
  • Rimfire ammo variability: Like all .22 semi-autos, reliability is strongly influenced by ammunition quality, lubrication, and cleanliness. Plan to test a few loads and stick with what your pistol prefers.
  • Distributor exclusive availability: Ruger lists Model 43961 as limited availability, so if you’re trying to match this exact blue/black configuration, it may be harder to find than standard catalog models.

Setup recommendations (practical, not overcomplicated)

  • Baseline reliability: Start with quality .22 LR loads, keep the pistol lightly lubricated, and clean on a consistent schedule.
  • Suppressor-ready checklist: Confirm thread protector removal/install procedures, verify alignment, and use the correct tools/torque guidance per manufacturer instructions.
  • Optics potential: Many Mark IV 22/45 Lite pistols ship with a factory Picatinny rail option in the lineup; if your specific package includes it, it can be a strong upgrade path for a dot.

Conclusion

The Ruger Mark IV 22/45 Lite (Model 43961) delivers exactly what most shooters want from a premium rimfire semi-auto: lightweight handling, an adjustable rear sight for real zeroing, and a 4.40" 1/2x28 threaded barrel that’s ready for modern muzzle accessories and suppressed shooting. Add in Mark IV one-button takedown and you get a pistol that encourages high round-count practice without the usual rimfire-cleaning dread.

If you want a .22 LR pistol that can serve as a serious trainer, a suppressor host, and an all-day range companion—while still looking distinct in blue/black—this model is an easy recommendation.

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