How does the 56mm objective lens and G4i Fibre reticle perform during low-light pest control in the Australian bush?

The 56mm objective lens utilizes DoubleHD glass and GPObright multi-coatings to deliver approximately 90% daylight light transmission, extending your shooting time deep into twilight and dawn. Combined with the ultra-fine, daylight-bright iControl fibre-optic red dot, it ensures precise target acquisition on foxes and pigs even in fading outback light.

What is the minimum parallax setting, and is this riflescope suitable for close-range rimfire pesting as well as extended-range deer hunting?

Yes, the side-focus parallax adjustment focuses from a minimum range of 10 metres all the way to infinity. This allows you to effortlessly transition from close-range rimfire pest control out to extended centrefire engagements across open country.

What type of battery does the iControl illumination use, and does it include an auto-shutoff feature for outback hunting trips?

The illumination system is powered by a universally available CR2032 3V lithium coin cell. It features an iControl automatic shutoff timer that turns off the power after 3 hours, position sensors to save battery when the rifle is tilted, and a low-battery indicator that warns you when power drops below 15%.

What rings or mounts do I need to attach the GPO Spectra 3-18x56i to my rifle, and are there compatible accessories available?

This riflescope features a standard 30mm one-piece aircraft-grade aluminum main tube, requiring standard 30mm riflescope rings or mounts for installation. If you are looking to secure your optics during active stalking or transport, it pairs exceptionally well with the GPO Bino Harness Pro.

Does this optic require any special electrical certifications or SAA approvals for use in Australia?

No special electrical approvals, SAA compliance, or RCM certifications are required. Because it is a self-contained optical device powered solely by a low-voltage internal CR2032 battery and does not connect to 240V AC mains power, it is fully exempt from these electrical regulatory requirements.

Hunting Riflescope - GPO RSX661 Spectra

The GPO Spectra 6x 3-18x56i G4i Fibre (RSX661) is a long-range hunting riflescope engineered for low-light target acquisition and extended-distance shooting. Built around a 30 mm one-piece aircraft-grade aluminium main tube, the optic combines a 6x zoom ratio with DoubleHD objective glass and GPObright multi-coatings delivering approximately 90% daylight light transmission. The second focal plane G4i Fibre reticle utilizes an illuminated, daylight-bright centre dot powered by a standard CR2032 battery with iControl power-management features, including automatic shutoff and angle-based power saving.

Key Features

DoubleHD 56 mm Objective Lens: Maximises light-gathering capacity for extended visibility during dawn, dusk, and nighttime shooting.
iControl Fibre-Optic Reticle: Features a steplessly adjustable illuminated German #4 red dot with a 3-hour auto-shutoff timer and low-battery indicator.
Side-Focus Parallax Adjustment: Adjusts focus from 10 m to infinity, accommodating both close-range rimfire pest control and long-range centrefire shooting.
Metric Turret Adjustments: Provides 1 cm at 100 m click adjustments with 250 cm of total elevation and windage travel, alongside tool-free zero-resettable dials.
Durability and Handling: Nitrogen-purged, waterproof, and fogproof housing with a removable magnification throw lever for fast adjustments in the field.

Specifications

Magnification: 3–18x
Objective Lens Diameter: 56 mm
Main Tube Diameter: 30 mm
Reticle: G4i Fibre (Second Focal Plane)
Field of View: 11.1 m to 1.9 m at 100 m
Eye Relief: 95 mm
Exit Pupil: 9.5 mm (at 3x) to 3.1 mm (at 18x)
Click Value: 1 cm at 100 m
Total Adjustment Travel: 250 cm at 100 m
Parallax Range: 10 m to infinity
Dimensions: 369.6 mm (Length)
Weight: 830 g
Power Source: 1× CR2032 lithium coin cell

Who is the GPO Spectra 6x 3-18x56i for?

Low-light pest controllers targeting foxes and pigs — Needs maximum light transmission in twilight conditions, provided by this long-range riflescope's large 56 mm objective lens, combined with a 95 mm eye relief for comfortable recoil clearance.
Open-country deer hunters engaging at extended distances — Relies on a broad 3-18x magnification range to identify and engage distant targets across open plains and clearings while maintaining a steady 830 g rifle setup.

Less suitable for: Lightweight mountain hunting or extended stalking where total carry weight is critical; compact scopes weighing under 550 g are better suited for these setups.

SKU	GPO40698LP
Model #	RSX661
Brand	Gpo
Shipping Weight	1.0000kg

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Gpo Rsx661 Spectra 6x 3-18x56i Riflescope G4i Fibre Reticle

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