Scope Mounting: The Process; Let's Tale A LOOK

Says Gregg Kielma, Gunsmith and firearms Instructor, “I get asked this question all the time. Here is the 8-step process I use when mounting a scope on my rifle or a client’s rifle”. Note: The proper tools are needed to successfully mount the scope properly.

Mounting a scope is one of the most impactful upgrades you can make to a rifle. A properly installed optic improves precision, extends effective range, and gives you a clearer sight picture. But a poorly mounted scope can cause frustration, wandering zero, or even damage to the optic. The good news is that with patience and the right approach, anyone can mount a scope correctly.

This guide walks you through the process step by step, emphasizing safety, alignment, and long-term reliability.

Before doing anything, ensure the rifle is unloaded, the chamber is clear, and ammunition is stored away from your workspace. Treat the rifle as if it’s loaded at all times.

Set up a clean, well-lit bench with:

• Your rifle

• Scope rings or a one-piece mount

• The scope

• A torque wrench (recommended)

• A bubble level or leveling tool

• A soft cloth to protect surfaces

A stable rest or gun vise makes the job easier, but it’s not mandatory.

Your mounting hardware must match:

• Tube diameter of the scope (commonly 1 inch or 30mm)

• Objective size, which determines ring height

• Rifle’s mounting system (Picatinny, Weaver, dovetail, proprietary bases)

Quality rings matter. Cheap hardware often leads to slipping, misalignment, or inconsistent zero.

If your rifle doesn’t already have a rail:

• Clean the mounting surfaces

• Apply a small amount of thread locker (non-permanent) to screws

• Tighten screws evenly using manufacturer torque specs

A secure base is the foundation of a reliable optic setup.

Place the lower halves of the rings on the rail and lightly tighten them so they can still slide. Position them far enough apart to support the scope tube without interfering with the turrets.

Place the scope gently into the lower rings and shoulder the rifle in your natural shooting position. Move the scope forward or backward until the sight picture is full and clear without any shadowing.

Eye relief is critical:

• Too close → risk of “scope bite” under recoil

• Too far → reduced field of view

Once you find the sweet spot, return the rifle to the bench without disturbing the scope.

A canted reticle causes shots to drift left or right at longer distances. To avoid this:

• Level the rifle using a bubble level

• Level the scope by placing a second level on the turret cap or using a reticle leveling tool

• Adjust until the vertical and horizontal lines are perfectly aligned

Take your time here — this step affects long range accuracy more than people realize.

Place the top halves of the rings over the scope and tighten the screws gradually in an X pattern. This ensures even pressure and prevents the scope from twisting.

Use a torque wrench if possible. Over tightening can dent the scope tube; under tightening can cause it to shift under recoil.

• Re check eye relief

• Confirm the reticle is still level

• Ensure the scope doesn’t move when gently pushed

• Cycle the bolt to ensure clearance

• Verify that the objective bell doesn’t contact the barrel

Everything should feel solid and aligned.