Choosing the right scope ring height ensures proper cheek weld, eye relief, and clearance for your objective lens. Here’s a quick guide to measuring and selecting the correct height.

What Scope Ring Height Means

Ring height is the distance from the top of the rail to the centerline of the scope tube. The goal is to:

1. Keep your cheek weld natural,

2. Provide enough clearance for the objective bell,

3. Prevent stress or misalignment on the scope tube.

Quick Steps to Measure

1. Measure scope tube diameter (OD): Common sizes are 1" (25.4 mm) or 30 mm. Divide by 2 to get the radius.

2. Decide desired centerline height (X): Based on cheek weld and objective clearance above barrel/handguard.

3. Match ring spec: Most ring makers list height from rail top to scope centerline. Choose the one closest to X.

4. Test fit: Mount the scope loosely, confirm eye relief and clearance, then tighten.

Typical Ring Heights (rail top to centerline)

• Low: ~12–18 mm (1" tubes, small objectives)

• Medium: ~18–25 mm

• High: ~25–35 mm (30 mm tubes, larger objectives)

• Extra-high: 35+ mm (oversized objectives, AR setups)

Tips

• If unsure, go slightly higher for safety.

• Use quality mounts to avoid misalignment.

• Always confirm zero after final torque.