Your front sight mod may work for your intended purpose. As I recall the difference in height between a standard 4" and a 6" Navy is approximately 0.1 inches or between 2 and 3 MM.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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