My pal Ric and I made up a number of these when we were competing in Airgun Field Target back in 1997 and 1998. The idea was to have a quick reference to check if you're canting the gun, something that can make a huge difference when you're trying to get a pellet through a 3/4" hole 50 yards away.
You can buy a commercial scope level, but they're extremely easy to make. All you need is an inexpensive level bubble, a cheap scope ring, and some epoxy. The bubbles came from string levels we bought at Home Depot, the rings were the cheapest aluminum .22 rings we could find, and the epoxy was generally J-B Weld. Saw off the clamp from a ring, add a dab of JB, press the bubble on, and let it set. It helps to put the ring in a vise to hold it while the epoxy sets.
In addition to serving as a shooting aid, a level like this is also very useful in installing a scope. Put the level on the unmounted scope, in a place where it won't conflict with the rings you'll be using to mount the scope. Find a horizontal or vertical reference- I like to use a piece of string and a weight. Align the crosshairs with your reference, adjust the level to center the bubble, and snug it up.
Now you've got an external reference that is perfectly aligned with the crosshairs. Mount the scope on your rifle, put a level on the rifle, and when you've leveled both the rifle and the scope, snug up the scope rings on the rifle.
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