I strongly suspect the design of the erector and adjustment system is very similar in most scopes from most manufacturers. Failures in any brand are most likely caused by simple assembly errors brought about by inexperienced, poorly trained, underpaid workers and management required rushed assembly and/or faulty, out of spec parts. As someone who has worked for years building guns and obtaining parts from many sources I can tell you it doesn't much matter where they're made, you'll get alot of absolute junk that is out of spec dimensionally and/or improperly heat treated from everywhere. Nobody gives a fugg about quality these days, only making as much money as possible as quick as they can.
