I've been using Hawkins ultralight for several years. I like the lightness of the rings and the built in level. Then I saw the Boring SARV that were advertised like an ounce lighter. I'm trying to build an NRL open light and looking for places to save to be able to use a ckye double or triple pull. The Boring are advertised at like 3.5 oz. and I got the 35mm to go with a lupey 3-18 mk 5. When the rings arrived I put them on my scale, they ended up being 4.1oz. Not what was advertised but still less than ultralights.
Super easy to level, very light, built in level and the seem more than tough enough. Might be my new favorite for bolt guns.