try replacing the Weaver Bases..

I had the same problem, with another brand of rings..

thought it had to be the rings... but then put them on another rifle with Weaver bases and they held fine...

the Weaver bases were a hair too narrow for specs, but replaced them and the Rings I was using worked out fine..

"Minus the killings, Washington has one of the lowest crime rates in the Country" Marion Barry, Mayor of Wash DC

“Owning guns is not a right. If it were a right, it would be in the Constitution.” ~Alexandria Ocasio Cortez