I am looking for suggestions for a small bubble level I can use when mounting a scope. I am trying to mount a scope on an AR using a cantilever mount. Usually I would use feeler gauges and a couple levels as I have with my bolt guns but the cantilever mount prevents me from putting anything under it. The handguard is a round one with no top rail so I can't place a level on that either. I just want a small or thin level I can put under the eyepiece of the scope on the top of the receiver. Once I get the rifle level I will verify everything with a plum Bob.