The rear sight on a BL-22 should be a 3/8 dovetail. If that is the case, you could try a lower rear sight. Go to Midway and search for "lyman folding rear sight". The other option is to get a taller front sight. Midway should have that too. Either way, you'll need to measure what you have and order another one one size shorter for rear or one size taller for front.
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