There are two methods of mounting a scope, the right way and the wrong way. Mounting a scope incorrectly can lead to a number of problems that can drive a person goofy if not recognized. Misaligned rings can bind the internal operations of the scope and lead to erratic adjustments or breakage. More times than not the problem is blamed on the scope manufacturer for an error caused by the user. Loose mounts can be detected by larger than normal groups or shifting groups. Though the only cure for loose mounts is to tighten them, fortunately there are ways to remedy misaligned rings.

Flaws in the mounts, the scope base, or imperfections in the ring itself cause these misalignments. Ideally the scope tube should be mounted so that the rings only tighten down on it with no additional stresses introduced. If the halves of the rings are not mirror creations of each other they can dent or kink the tube. Then if the base has an imperfection this will multiply the stresses placed on the scope.

Burris Company makes a base and ring system that allows the average Joe to mount a scope stress free without any special tools. The Signature series rings fit any type of turn-in style base and the Signature Zee rings fit a Weaver style base. The key feature of this system is a plastic insert within the ring; the insert fits perfectly onto the scope. The inside of the scope ring is milled so the insert floats while being tightened so as not to place stress on the scope tube. This will allow for precise alignment of the mounting system. I have used this system on several rifles and handguns with excellent results. The cost of the Burris Signature series mounts is typically in line with any other high quality scope mount such as Leupold or Redfield.

If you are like me and could not afford to switch every scope mount you have to the Burris Signature system there is another options to explore. Lapping the inside of rings while mounted on the firearm will remove imperfections. Ring lapping kits are available from most major shooting supply houses. The kit I use is from Brownell's and consists of a steel lapping bar with handles and lapping compound. The kit is simple to use.

Lapping the rings is a basic gunsmithing task that you can easily perform yourself with a few basic tools.

With the scope base and bottom half of the rings installed apply a light coating of lapping compound to the rings and lapping bar. Then lay the bar into the rings and apply compound to the top half of the rings then install. You'll only want to lightly snug the ring screws, anything much tighter than "finger tight" and you will not be able to move the bar. Now with the handles installed on the bar and firearm secured, work the bar back and forth. Remove the top half of the rings from time to time to inspect progress. You will see where the bar and compound are evening the rings. Though it takes a little elbow grease this system will align the bearing surface of the rings.

To make this job easier I removed both handles and installed a short piece of all-thread in the end of the bar with about 1.5" sticking out. A nut is then threaded on and tightened against the bar. I then took my hand grinder and flattened three sides on the all-thread; onto this I put my cordless drill. With the speed set of low I start spinning the lapping bar and working it back and forth. Go slowly remembering to check progress and gradually tighten the ring screws.

These rings have been fully lapped. Care must be taken not to take too much of the surface off, otherwise the rings won't grip the scope firmly enough.

I usually lap rings until about 80 to 90% of the inside has been cleaned up. If you lap too much material from the rings they won't be able to tighten down to hold the scope securely.

When care is taken to mount a scope you will experience more reliable operation. I won't even mount a scope without using the Burris Signature system or lapping the rings. Since taking more attention to the way optics are installed I have noticed my firearms group better with less stray shots, the optics are clearer, and adjustments are more dependable. All this comes from mounting a scope stress free.

Good shooting,
Dan B.