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Champion 9 mm

You’ll either need to adjust your hold (realize that all full size pistols, like RO’s, are regulated to 25m/yds, not 10), or get a shorter front sight.

As to how short? You’ll need to do the math. There are sight height calculators out there (google is your friend); measure your existing front sight and go from there.

Probably easier to put in an adjustable rear.
 
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