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There are a number of differant height , original front sight blades made by the Carl Gustafs Rifle factory . They range in 0.25 increments ( plus or minus ) & are used to adjust the rifles zero . A " zero " front sight blade would be the most commonly used . Due to differances in manufacturing , no two rifles will shoot the same zero when made new . Yours needed the +0.50 front sight blade . There is nothing wrong with your rifle , as various height front sight blades are VERY common .