Re: Any other scope mounts with built in level.
Farrell Industries has a slick little level that fits in a slot that is milled in the top of the rings they manufacture. I just received one of the bubble levels last week it fits like a glove. It is secured by a small screw in a counter sunk hole in the underside of the top 1/2 of the rear ring. I have one of their 20 MOA rails and matching rings. The quality of their products is impressive.