Sportsmatch OP25C 1 inch Medium Double Screw One Piece 9-11mm Dovetail Rifle Scope Rings

OP25C Medium Mounts (1-Piece with Easyfit Arrestor Pins)

The OP25C is a medium-height, 1-piece scope mount designed for 25mm (1") tube scopes and standard 9–11mm dovetail rails. With a streamlined profile and built-in Easyfit arrestor pins to resist recoil shift, this mount is ideal for air rifles and rimfires that need secure, reliable scope alignment.

Key Specs

• Ring Diameter: 25mm (1")

• Base Type: 9–11mm dovetail

• Mount Type: 1-piece + (C) base clearance: 5.5mm (approximate)

• Height (A): 19mm (base to ring bottom), 31.7mm (base to ring centre)

• Length (B): 110mm

• Special Feature: Includes Easyfit arrestor pins for enhanced scope hold

What These Specs Mean
25mm rings are a popular size for lightweight and traditional scopes, particularly well-matched with air rifles and rimfires used in pest control and hunting.

The 9–11mm dovetail base is standard on many UK-spec rifles, including those from BSA, Weihrauch, and Air Arms, making compatibility straightforward for most shooters.

At 19mm in height (base to ring bottom), the OP25C sits low enough to offer a natural cheek weld while still clearing most 40–44mm objective scopes.

Being a 1-piece design, it provides maximum alignment stability and reduced shift under recoil — ideal for spring-powered setups. However, it does require a continuous rail and may not suit rifles with interrupted dovetail sections.
Note: If your scope has an unusually deep turret block (saddle), ensure there's enough underside clearance — this is rare, but worth checking with some full-size or tactical scopes.

The Easyfit arrestor pin system gives added security against rearward mount movement under recoil. It anchors into pre-drilled holes on many air rifles, preventing scope creep and ensuring long-term zero retention.

Usage Suitability
✔ Ideal for spring-powered or recoiling air rifles
✔ Compatible with most standard 25mm tube scopes
✔ Works well with rifles using 40–44mm objectives
✔ Great choice for setups needing reliable hold against vibration

Not Compatible With
✘ Picatinny or Weaver rails
✘ Oversized dovetails, such as:
 • 13mm BSA
 • 15mm–19mm dovetails (Tikka, Parker Hale, CZ, Brno, Sako)
✘ Split dovetail rails or short carbine actions
✘ Drilled and tapped receivers with no dovetail rail

Calculating Scope to Rifle Clearance
To estimate if the mount gives enough objective clearance:

1. Measure the full outer diameter of your scope’s objective bell

2. Divide by 2 to get the radius

3. Subtract half the ring diameter (12.7mm for 25mm rings)

4. Result is the minimum mount height required

5. Add 1mm for safety

Example:
54mm bell → 27mm radius
27 – 12.7 = 14.3mm required
OP25C provides 19mm → ample clearance (~4–5mm spare) in flat rail setups

Note: This is a guide — actual clearance may vary depending on rifle rail height, barrel profile, or if lens caps are used.

About Sportsmatch
Sportsmatch UK builds their mounts in Britain to precise tolerances for dependable, no-shift performance. The OP25C is a top choice for serious airgunners and rimfire shooters who want solid fit and recoil resistance. Backed by a full lifetime warranty.