This is a Ruger Mark IV "Hunter" .22 lr. This is the premium model of the the Mark IV series.
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Simple, one-button takedown for quick and easy field-stripping and proper chamber to muzzle cleaning. A recessed button in the back of the frame allows the upper receiver to tilt up and off of the grip frame without the use of tools.
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One-piece, precision CNC-machined grip frame.
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Ergonomic bolt stop.
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Smoothly contoured, comfortable grip features natural pointing grip angle with replaceable, checkered grip panels for a non-slip hold.
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Internal cylindrical bolt construction ensures permanent sight to barrel alignment and higher accuracy potential than conventional moving slide designs.
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Contoured ejection port and easy-to-grasp bolt ears allow for durable and reliable operation round after round.
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Accurate sighting system features adjustable rear sight and drilled and tapped receiver for Weaver- or Picatinny-style rail for easy mounting of optics (rail not included).
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Ambidextrous manual safety positively locks the sear in the "SAFE" position when applied. Safety can be converted to left-side only with included washer.
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Features a conveniently located push-button magazine release on the left side of the frame.
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Magazine drops free on release for faster reloading.
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Magazine disconnect prevents discharge when the magazine has been removed.
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Also includes: two, 10-round magazines. Source: Ruger.com