How does the fixed 100-metre parallax affect performance when shooting at very close or long ranges?

The GPO Spectra 4x 2.5-10x44i features a parallax fixed at 100 metres, which is ideal for the typical close-to-mid-range distances encountered during big game stalking. If you plan on dedicated long-range shooting beyond 500 to 600 metres, or precise rimfire and airgun shooting under 50 metres, a riflescope with an adjustable side-focus parallax will be much better suited to avoid parallax error.

What battery does the illuminated reticle use, and does it require any special Australian electrical approvals?

The illuminated G4i Drop reticle is powered by a single standard CR2032 3V coin cell battery, featuring an automatic 3-hour stationary shut-off and a low-battery indicator. Because this optic operates solely on a low-voltage coin battery and does not connect to 240V AC mains electricity, SAA and RCM electrical approvals are not applicable for use across Australia.

What mounting rings are required to attach this scope to a rifle in Australia?

The GPO Spectra 4x 2.5-10x44i is built on a 30 mm main tube diameter, so it requires standard 30 mm mounting rings and bases for secure attachment. Weighing approximately 619 grams with a 44 mm objective lens, it balances well on standard centerfire hunting rifles used in Australian bush and timber environments.

Hunting Riflescope - GPO RS421

The GPO Spectra 4x 2.5-10x44i (MPN: RS421) is a variable-power hunting riflescope engineered for close-to-mid-range game shooting. Built on a 30 mm main tube, it features a 4x optical zoom factor delivering 2.5x to 10x magnification paired with a 44 mm objective lens. Optical performance is supported by DoubleHD objective lens elements and proprietary GPObright multi-coatings. For aiming, the optic utilises a Second Focal Plane (SFP) G4i-Drop ballistic reticle with integrated holdover lines and iCONTROL fiber-optic microdot illumination powered by a single CR2032 3V battery.

Key Features

Optical System: DoubleHD lens elements with GPObright multi-coatings provide high-transmission light gathering and color fidelity across the 2.5x–10x magnification range.
Reticle and Illumination: Second Focal Plane G4i-Drop reticle features continuously variable microdot illumination, an integrated low-battery indicator, and an automatic 3-hour shut-off feature.
Adjustment Turrets: Capped PASSIONtrac resettable turrets provide 0.1 MRAD (1 cm at 100 m) click adjustments with a total elevation and windage travel range of 235 cm at 100 m.
Durable Construction: Built on a 30 mm aircraft-grade aluminum tube, measuring 340 mm in length and weighing 619 g, with full waterproof and nitrogen-purged fog-proof integrity.

Specifications

Magnification: 2.5x – 10x
Objective Lens Diameter: 44 mm
Main Tube Diameter: 30 mm
Reticle: G4i-Drop (Second Focal Plane)
Field of View at 100 m: 16.2 m (at 2.5x) to 4.1 m (at 10x)
Exit Pupil: 12.3 mm (at 2.5x) to 4.4 mm (at 10x)
Eye Relief: 95 mm
Parallax: Fixed at 100 m
Adjustment Click Value: 1 cm at 100 m (0.1 MRAD)
Total Adjustment Range: 235 cm at 100 m
Dimensions: 340 mm (L) × 72.6 mm (W) × 62 mm (H)
Weight: 619 g
Battery Type: 1 × CR2032 (3V)

Who is the GPO Spectra 4x 2.5-10x44i for?

Stalking hunters pursuing medium game in dense bush and timber — requires a wide 16.2 m field of view at 2.5x magnification to quickly acquire moving targets at close quarters, combined with a 619 g overall weight on a 30 mm main tube that keeps a carry rifle balanced.
Spot-and-stalk hunters engaging targets at twilight and dawn — utilizes a 44 mm objective lens diameter combined with DoubleHD multi-coated optics and an illuminated holdover reticle to maintain target clarity and precise aiming points in low ambient light.

Less suitable for: Dedicated long-range shooting beyond 500 to 600 metres, where a high-magnification riflescope featuring an adjustable side-focus parallax turret is required to eliminate parallax error past the fixed 100 m factory setting; or precise rimfire and airgun shooting under 50 metres, which requires an optic with adjustable close-range parallax focus.

SKU	GPO40681LP
Model #	RS421
Brand	Gpo
Shipping Weight	1.0000kg

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Gpo Spectra Rs421 Riflescope 2.5-10x44i G4i Drop

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