What size dovetail rails and scope tubes are compatible with the Sportsmatch OP12?

The Sportsmatch OP12 is engineered to fit standard 1-inch (25.4mm) scope tubes and is designed for 9.5mm to 11.5mm (3/8 to 11mm) dovetail rails commonly found on rimfire rifles and airguns. This one-piece mount features a 120mm base length and a medium height profile with 19mm from the base to the ring center, accommodating scopes with objective lenses up to 45mm.

How does the extension design of the OP12 help correct eye relief issues?

The OP12 features an offset design where one scope ring is shifted by 10mm, allowing the entire scope to be positioned 35mm further forward or backward compared to standard inline mounts. This extension is particularly beneficial for legacy air rifles and specific target shooting setups in the Australian bush where adjusting eye relief for a comfortable cheek weld is critical.

Does the Sportsmatch OP12 require any electrical safety certifications for use in Australia?

No electrical safety certifications, such as an Australian RCM or SAA approval, are required for the Sportsmatch OP12. Because this product is a purely mechanical, high-grade aluminum scope mount containing no electrical circuits, cords, or batteries, 240V and electrical compliance standards do not apply.

Does the OP12 include a recoil arrestor pin for heavy-recoiling spring-piston air rifles?

Unlike some other Sportsmatch one-piece mounts, the OP12 does not include a recoil arrestor pin. It is specifically designed for low-to-medium recoil rimfire rifles like .22 LR and .17 HMR, or airguns where a traditional arrestor pin is not required or cannot be accommodated by the rifle's receiver.

Scope Mount - Sportsmatch OP12

The Sportsmatch OP12 (also designated as the OP12C) 3/8" 1-Piece 1" Medium Extension Single Screw Scope Mount is a precision-engineered mounting solution manufactured in the United Kingdom. Crafted from high-tensile, aircraft-grade aluminum alloy, this mount provides absolute rigidity, precise alignment, and excellent recoil resistance. It features an offset design where one scope ring is moved by 10mm, allowing the entire rifle scope to be positioned 35mm further forward or backward compared to standard inline mounts. This extension capability is essential for fine-tuning eye relief and achieving a comfortable, natural cheek weld. As a passive, purely mechanical firearm accessory, this mount requires no batteries or electrical circuits, and is exempt from Australian RCM or SAA safety compliance certifications.

Key Features

Bi-Directional Extension: The offset design allows for up to 35mm of forward or backward movement to optimize eye relief.
High-Tensile Aluminum Alloy Construction: Offers maximum structural integrity and recoil resistance while keeping weight to a minimum.
Single-Side Clamp Base: Secured by high-tensile Allen key bolts to ensure a reliable grip on standard rails.
Integrated Port Clearance: Features an 85mm body cut-away designed to clear loading ports on various rifle actions.
Arrestor Pin Exclusion: Specifically designed without a recoil arrestor pin, making it highly compatible with actions where a pin is not required or cannot be accommodated.

Technical Specifications

Model Code: OP12 / OP12C
Scope Tube Compatibility: Fits 1" (25.4mm) diameter scope tubes.
Base / Rail Compatibility: Fits 9.5mm to 11.5mm (3/8" to 11mm) dovetails, the standard for modern air rifles and rimfire rifles.
Dimension A (Height to Ring Center): 19mm (medium profile, suitable for scopes with an objective front lens diameter up to 45mm).
Dimension B (Total Base Length): 120mm.
Dimension C (Clamp Width / Projection): 5.5mm.
Body Cut-Away Length: 85mm.
Weight: 131 grams.

Who It Is For

The Sportsmatch OP12 is designed for Australian target shooters, pest control operators, and small-game hunters utilizing rimfire rifles (such as .22 LR and .17 HMR) or spring-piston air rifles. It is particularly useful for shooters operating legacy actions, vintage BSA air rifles, or target setups that feature integrated dovetails with non-standard eye-relief spans. This mount is a standard choice for Australian gunsmiths and specialized retailers looking to solve eye-relief limitations on classic and modern rimfire configurations.

SKU	SPM39138LP
Model #	OP12
Brand	Sportsmatch
Shipping Weight	1.0000kg

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Sportsmatch Op12 Scope Mount 3/8 Inch 1 Inch Medium Extension

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