I wouldn't worry about the strength. But those are pretty cheap rings and I might question the precision. I don't think it is necessary to purchase some of the $100+ rings out there either and I'd avoid anything with dovetail's like the plague.
The Burris Z rings and original Weaver rings with steel straps on them are plenty strong, well made and won't break the bank. I also like the Talley Lightweight or DNZ rings where the lower ring is part of the base.
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Winston Churchill
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