Ruger Mark IV 22/45 5.5″ Bull | MPN 40187

The Ruger Mark IV 22/45 is a rimfire, semi-automatic pistol built around a 5.50-inch bull barrel and a checkered synthetic grip frame. It includes two 10-round magazines, an adjustable rear sight, a fixed front sight, and a drilled-and-tapped receiver for Weaver/Picatinny-style optics. For a practical optic under $1,000 that pairs well with this platform, consider a compact red-dot such as the Vortex Venom or Holosun 507 family for fast sight acquisition on the range.

Well-suited to precision rimfire target work and recreational plinking, the Mark IV 22/45 also serves for informal rimfire competition and small-bore skill development.

Product Specifications

• The UPC is 736676401871.
• The manufacturer is Ruger.
• The model is listed as Mark IV 22/45 (Model 40187).
• The caliber is .22 LR.
• The action is Semi-Auto.
• The barrel measures 5.50 inches.
• The magazine capacity is 10 rounds.
• The product includes two 10-round magazines.
• The optic footprint is PICATINNY.
• The sights are Adjustable rear and fixed front.
• The barrel style is a Bull barrel.
• The listed finish is Blued.
• The weight is 34.4 ounces.
• The overall length is 9.75 inches.
• The grips are Checkered black synthetic.

The Mark IV 22/45 offers Ruger’s well-known one-button takedown for fast field stripping, a user-friendly bolt and ejection design, and a drilled-and-tapped receiver for optic mounting. The included magazines and adjustable sights make it ready for range use and training right out of the box. Its combination of a heavy bull barrel and rimfire chambering provides a stable, predictable shooting experience for precision practice and casual target sessions.

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