Getting a new rifle scope is exciting, but knowing how to install rifle scope correctly is what makes it worth it. A poorly mounted scope can ruin your accuracy, no matter how expensive your gear is. This guide will walk you through the entire process, from gathering tools to final checks, ensuring your scope is secure and perfectly aligned.
You don’t need to be a master gunsmith. With some patience and the right steps, you can achieve a rock-solid mount. We’ll cover everything in simple, clear language. Let’s get your scope ready for the range.
How To Install Rifle Scope
This section is your core step-by-step guide. Before you start, make sure you have a clean, well-lit workspace. Gather all your tools first to avoid frustration. Rushing is the most common mistake, so take your time.
Gather Your Tools and Materials
Having everything at hand is crucial. You will need:
- Your rifle and the new scope.
- A compatible scope mounting base and rings (check your rifle’s make and model).
- A gunsmithing screwdriver set or hex/Allen key set that fits your ring and base screws precisely. Using the wrong size can strip the heads.
- A torque wrench (inch-pounds, not foot-pounds) is highly recommended.
- Gun cleaning solvent and patches.
- Degreaser (like rubbing alcohol).
- Blue Loctite (thread locker) for screws.
- A small bubble level or a leveling kit.
- Lens cleaning cloths.
Step 1: Prepare the Rifle and Mounting Surface
First, ensure the rifle is completely unloaded. Remove the bolt or open the action so you can see through the barrel. This is a critical safety step.
Next, if there’s an old scope or bases, carefully remove them. Clean all the mounting screw holes on the receiver with solvent and a patch to remove any old oil or debris. Follow up with a degreaser on the mounting surfaces and in the holes. This ensures a clean, oil-free surface for the new base to sit solidly and for the screws to grip properly.
Step 2: Install the Scope Base
Place the base onto the rifle’s receiver. It should sit flush without any wobble. Insert the provided screws, applying a tiny drop of Blue Loctite to the threads of each one. Begin tightening the screws by hand in a criss-cross pattern, like tightening a car tire, to apply even pressure.
Finally, use your torque wrench to tighten them to the manufacturer’s specification. This is usually between 15-30 inch-pounds, but always check your base’s manual. Overtightening can damage the receiver or strip the threads.
Why a Torque Wrench Matters
It guarantees consistent pressure on all screws. Finger-tightening is not enough, and using a regular driver can easily lead to over-torquing. A proper wrench protects your investment and ensures the mount won’t come loose from recoil.
Step 3: Set the Scope in the Bottom Rings
Before installing the rings on the base, often it’s easier to attach the bottom halves of the rings to the scope first. Loosen the ring screws so the scope can slide in. Place the scope in the bottom halves, roughly positioning it for proper eye relief.
Eye relief is the distance your eye needs to be from the scope to see a full picture. You typically want 3-4 inches. Find it by shouldering the rifle with your eyes closed, then opening them. You should see a full, clear circle of view without any dark shadows (called scope shadow). Adjust the scope forward or back until it’s perfect.
Step 4: Level the Scope
This is a vital step for accuracy at different ranges. Place the rifle in a solid gun vise or on sandbags so it’s perfectly steady. Place a small bubble level on a flat part of the rifle’s receiver (like the flat of the ejection port) and level the rifle itself.
Then, place another level across the flat top of the scope’s elevation turret (the dial on top). While keeping the rifle level, carefully rotate the scope until the scope’s level reads level. This ensures the crosshairs are perfectly vertical and horizontal relative to the rifle. It takes a minute but prevents canting errors.
Step 5: Attach the Top Rings and Final Tightening
Once leveled, place the top halves of the rings on. Insert the ring screws finger-tight, again in a criss-cross pattern. Now, begin the final tightening sequence with your torque wrench.
Start by snugging the ring screws that connect the two ring halves together, following the manufacturer’s torque specs (often 15-18 inch-pounds). Do not fully tighten one side before the other; alternate in small increments. Finally, tighten the ring-to-base screws to their specified torque.
Step 6: Bore Sighting and Final Checks
Bore sighting gets you on paper quickly. Secure the rifle so it cannot move. Look directly through the bore (barrel) from the breech end and center a target object about 50 yards away. Without moving the rifle, adjust the scope’s windage and elevation dials until the crosshairs are centered on that same object.
Do a final check of all screws with the torque wrench. Wipe down the lenses with a clean cloth. Your scope is now installed! Remember, bore sighting is not a substitute for live-fire zeroing at the range. You’ll need to fine-tune your zero with actual shooting.
Common Mistakes to Avoid
- Overtightening screws: This is the number one error. Use a torque wrench.
- Ignoring eye relief: A scope too far forward or back is uncomfortable and unsafe.
- Skipping the leveling step: A canted scope causes missed shots.
- Forgetting to degrease: Oil causes screws to loosen under recoil.
- Using poor quality rings and bases: Don’t skimp on the parts that hold your expensive scope.
FAQ Section
How do I mount a rifle scope at home?
You can mount a rifle scope at home by following the steps above. The key is having the proper tools, especially a torque wrench and levels, and working slowly on a clean, stable surface. It’s a very achievable DIY project for most shooters.
What tools are needed for scope installation?
Essential tools include a gunsmithing screwdriver set, a torque wrench (inch-lb), degreaser, Blue Loctite, and bubble levels. A gun vise is extremely helpful but not absolutly necessary if you use firm sandbags.
How tight should scope ring screws be?
Scope ring screws should be tightened to the manufacturer’s specification, which is typically between 15-18 inch-pounds for the ring halves and a similar range for the base screws. Never guess—over-tightening can crush the scope tube or damage threads.
Why is my scope moving after I shoot?
If your scope is moving, it’s likely due to loose mounting screws, dirty/oily mounting surfaces, or insufficient torque. Check all screws with a torque wrench after the first few shots, as they can sometimes settle. Also, ensure you used a degreaser and thread locker during installation.
Can I use red Loctite on my scope mounts?
No, you should avoid red Loctite. It’s a permanent thread locker that requires extreme heat to remove. Use only Blue Loctite (medium strength) for scope mounting screws, as it secures them from vibration but allows for removal with hand tools when needed.
Installing your own rifle scope is a satisfying skill that improves your understanding of your equipment. By taking it step-by-step and using the right tools, you’ll end up with a reliable, accurate setup. Always double-check your work and finish the job with a proper zeroing session at the range. Now you’re ready to shoot with confidence.