Begin by mounting the scope base and rings according to the manufacturer’s directions; however, do not tighten the rings down completely at this point. If installing a scope base, be sure to degrease the screws and holes before applying a blue thread locking compound. Also, if the scope mounting system uses straight slot screws, be sure to use the proper gunsmith screwdriver not a standard screwdriver otherwise you will more than likely strip the slot.
Next ensure that the rings will allow the scope to be mounted with the proper eye relief. Lay the scope in the bottom portion of the rings. Place the top halves of the rings over the scope. Insert the screws only enough to prevent the scope from sliding when raising the firearm; do not over-tighten. Check to see that the scope can be adjusted forward or rearward enough to obtain the correct eye relief. If the rings are interfering with the correct scope placement, move them as needed. Once an acceptable location is found, tighten the scope rings down onto the base.
Align the misaligned
The next step is often omitted by many and can lead to scope damage, inaccuracy, and scope movement from recoil. For this step, a scope ring lapping kit is required. This kit includes a lapping bar matching the diameters of your scope and rings, and some lapping compound. Even high-quality scope rings are often misaligned and not perfectly round.
Lapping the inside of the rings increases the holding surface of the rings and eliminates denting and bending the scope tube, which can distort the crosshairs and cause adjustment problems.
To begin the lapping process, remove the scope and set it aside. Cover the receiver with an old cloth to protect it from the lapping compound. Add the lapping compound to the inside of both halves of the scope rings, ensuring not to get any compound in the screw holes or on the screws. Place the lapping bar on the rings and install the top halves. Tighten the rings just enough to ensuring the lapping bar can still be moved.