DiscoveryOpt MS 4-16×42 AOAC SFP Scope

A higher-magnification MS-series scope for shooters who want greater control over focus and parallax for precision-oriented airgun shooting.

The 4-16× magnification range provides substantially more target detail than a conventional 3-9× scope, while the Adjustable Objective allows the shooter to correct focus and parallax for different target distances.

This makes the MS 4-16×42 AOAC particularly useful for supported target shooting, zeroing and grouping. Its MS-series construction also makes it particularly relevant to spring-piston airgun shooters who need an optic designed with demanding recoil in mind.

Discovery's current specification confirms 4-16× magnification, SFP construction, 25.4 mm tube, 1/4 MOA adjustments and adjustable parallax from 5 yards to infinity. 

Key Specifications

• Brand: DiscoveryOpt
• Model: MS 4-16×42 AOAC
• Magnification: 4-16×
• Objective Lens: 42 mm
• Focal Plane: Second Focal Plane (SFP)
• Parallax Adjustment: Adjustable Objective (AO)
• Parallax Range: 5 yards to infinity
• Tube Diameter: 25.4 mm / 1 inch
• Click Value: 1/4 MOA
• Elevation Adjustment: 80 MOA
• Windage Adjustment: 80 MOA
• Field of View: 28.3-8.4 ft @ 100 yd
• Exit Pupil: 10.2-2.6 mm
• Eye Relief: 3.3-2.8 in / 8.3-7.2 cm
• Length: 326 mm
• Weight: 530 g
• Illumination: Red, 6 brightness settings*
• Fogproof: Nitrogen purged
• Water Resistance: IP66

ONE77 Scope Fit Guide

Recommended For: Spring-piston, gas-ram and PCP air rifles where precision and adjustable parallax are priorities

Best Use: Precision target shooting, grouping, zeroing and supported shooting across varying distances

Shooting Position: Best suited to benchrest and supported positions; usable standing at lower magnification, but its additional size, weight and magnification make it less convenient offhand than a lighter 3-9× or fixed 4× optic

Magnification Advantage: 4-16× provides substantially greater target detail for deliberate precision shooting

Parallax Type: Adjustable Objective — allows focus/parallax correction for the actual shooting distance and is especially useful at typical airgun distances

ONE77 Note: Choose this over the MS 3-9×40 when precision, small aiming points and shooting at different distances matter more than minimum weight and simplicity. For primarily standing/plinking use, the 3-9×40 may actually be the better-balanced choice.

Mount Compatibility

Requires 25.4 mm / 1-inch scope rings.

Because this scope is heavier than the MS 3-9×40, secure mounting becomes particularly important on a recoiling spring-piston air rifle.

What's Included

DiscoveryOpt MS 4-16×42 AOAC Scope

Accessories as supplied in the product packaging. Discovery's current version lists a sunshade, lens caps, cleaning cloth, manual and specification documentation, but the actual ONE77 box contents should be checked before we promise individual accessories. 

Please Note

Higher magnification is not automatically better for every shooter. Standing shooters may find lower magnification easier to use, while 12-16× becomes substantially more useful when the rifle is supported.