Quick Answer
To properly align a scope with the barrel, start by ensuring the scope rings are securely attached to the scope and the rifle's receiver. Next, adjust the scope's elevation and windage until it's centered on the target. Use a bore sighter or a laser to fine-tune the alignment.
Attaching the Scope Rings
When attaching the scope rings to the rifle’s receiver, use a scope ring screwdriver to tighten the screws in a star pattern. This ensures even pressure is applied to the scope and prevents damage to the scope or the receiver. For a standard AR-15 or similar rifle, use a 1/8" or 1/4" scope ring screwdriver, and tighten the screws to 20-25 in-lbs. For heavier scopes or rifles, use a 1/2" or 3/4" scope ring screwdriver.
Aligning the Scope with the Barrel
To align the scope with the barrel, use a bore sighter or a laser to initially set the scope’s elevation and windage. These tools will help you get close to the target, but fine-tuning is still necessary. For a bore sighter, adjust the scope’s elevation and windage until the reticle is centered on the target at 100 yards. For a laser, adjust the scope’s elevation and windage until the laser dot is centered on the target. Once you’ve made these adjustments, use the rifle’s iron sights or a separate aiming device to fine-tune the scope’s alignment.
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