Try Novak. He should know for sure as he's been in the night sight industry for years. I would call or email.
https://www.novaksights.com/Products.aspx?CAT=9524
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Exceptions are so inevitable that no rule is without them - except the one just stated. - Paso Por Aqui, by Eugene Manlove Rhodes
"I ask you sir, who are the militia? They consist now of the whole people........" George Mason
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