4-12x50 Guardian AO SFP Scope - Open Box

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$64.99 - $69.99
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It means this product has passed our rigorous 21 point inspection checklist and has been certified as renewed by the Monstrum Quality Control.

Monstrum Open Box Clearance products come with a 30 day money back guarantee and a 1 year warranty. 



Like-new - No sign of wear, everything included.

Blemished - Signs of wear, no signs of electronic, mechanical, or optical defects, everything included.


Types of Blemish Explained: Signs of scope being previously mounted (most common), scratches that do not penetrate finish (moderately common), scratches that penetrate finish (less common - any scratch that penetrates finish and exceeds 2" is not sold), signs of usage on prism turret housing (moderately common).


Any scope that has a scratch that penetrates the finish (aluminum exposure visible) that exceeds 2", any dents, or any gouges are destroyed and not resold.


  • Includes: SG41250AO-B Rifle Scope, Scope Rings, Lens Cloth, Lens Cover
  • Reticle: Crosshair Reticle
  • Materials: 6061 Aircraft Grade Aluminum
  • Compatibility: Rifles with Picatinny Rails.
  • Scope Range: Close to Mid Range, 500+ Yards.
  • Magnification: 4-12x
  • Objective Diameter: 50 mm
  • Tube Size: 1 in
  • Eye Relief: 3.5-3.8 in
  • Weight: 15 oz
  • Length: 14 in
  • Color: Black
  • Fog & Water Resistant? Yes (Nitrogen Sealed)
  • Warranty: Lifetime

The Monstrum Guardian Series is the latest iteration from our best selling line of SFP rifle scopes! The Guardian 4-12x AO is a full-featured scope suitable for hunting, target shooting, or tactical use, the scope comes equipped with: Adjustable 4-12 times magnification, for targeting out to 600 yards and beyond. An adjustable objective lens or AO - that allows for sharper focus of the target image, elimination of parallax, and range estimation. Fully illuminated MOA reticle with MOA hashmarks for ranging information and inline dial controlled brightness adjustments. Precision 1/4 MOA/click windage and elevation adjustments. Anodized aircraft grade 6061 aluminum construction, for lightweight and durable performance. An integrated throw lever for smooth and controlled adjustment of the magnification dial. Package includes: A set of standard profile scope rings compatible with all Picatinny or Weaver mounting platforms, A set of flip up lens covers, One CR2032 battery

What is Parallax?

In terms of shooting, parallax refers to the alignment of the shooter’s eye in relation to the scope reticle and the target object. Unless properly focused, a shift in eye position will result in a shift in the position of the reticle relative to the target - the parallax effect. With a fixed objective lens scope (without AO), small shifts in eye position may result in imprecise targeting and less accurate shooting.

What is AO?
AO stands for adjustable objective (sometimes referred to as parallax adjustment).  An AO scope allows you to adjust the objective lens of the scope, bringing the target image into focus with the plane of the reticle.  When in focus with the plane of the reticle, the parallax effect is eliminated.  An AO scope allows you to 1) bring your targets into sharper focus 2) eliminate parallax and 3) gather ranging information about your target.


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