Nailed itA simple bubble level in various forms can be had for as little $25-30. These inexpensive bubble levels can work VERY well to keep the rifle level if set up properly, and the cost is not so expensive as to be prohibitive to large numbers of shooters. I cannot envision how the expensive electronic level shown above would work any better for the intended purpose of keeping the rifle level, even though I admit it would look a lot cooler. The product description implies it is easier to see, and therefore "faster" to use. In any event, the ruling against electronic levels seems a bit capricious to me, but it is what it is.