March FX 4.5-28 WA. I just picked one up. If under 30 oz is your benchmark for "lightweight" and optical quality, build quality, and FOV is important, I don't think there are many scopes that can compare.
I have a couple of Leupy MK5 3-18s on some other guns, which were my previous go to lightweight scopes. The difference is astounding. The wide angle eyepiece on the March is pretty spectacular, especially at the high mag ranges between 18-22. I never really use the upper tier of my mag ranges to try and maximize my FOV. This scope shines in that regard.
I have a couple of Leupy MK5 3-18s on some other guns, which were my previous go to lightweight scopes. The difference is astounding. The wide angle eyepiece on the March is pretty spectacular, especially at the high mag ranges between 18-22. I never really use the upper tier of my mag ranges to try and maximize my FOV. This scope shines in that regard.