Choosing the correct ring height is crucial for both comfort and performance. The goal is to get your scope as low as possible to the bore of the rifle without it touching the barrel or the objective bell (the front lens) hitting the rail.
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The "Low as Possible" Rule: A lower mount provides a better cheek weld and a more consistent shooting position. It also reduces the offset between the line of sight and the bore axis.
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How to Measure: Place your unloaded rifle in a safe position. Place a straight edge (like a ruler) across the top of the receiver or rail. Use calipers to measure the distance from the bottom of the straight edge to the highest point on the barrel. Then, check the specifications of your scope—most manufacturers list the required clearance for the main tube and objective bell. Choose a ring height that provides 1-2mm of clearance beyond these minimums to be safe.
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Pro Tip: Many ring manufacturers offer online tools or PDF guides where you input your rifle and scope model to get a recommended height.
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