The lightest 30mm ring that will fit a Weaver Slot is Ken Farrel, they are also the lowest.
TPS HRT rings are light weight and fit Weaver slots.
As iddave posted above, Warne Mountain Tech will fit weaver slots (although I failed to indicate such on my list).
This thread has loads of info.
https://www.24hourcampfire.com/ubbt...catinny-rail-heights-listed#Post14214699@Akwolverine, I wasn’t aware Vortex Precision Matched rings fit Weaver slots. The spec could have changed or I could be wrong. Please follow up if you see this.
As far as Seekins branded rings, only their 1” rings fit Weaver slots.