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they could just laser etch the rating on the end of the spring where it's ground flat.
better yet, coat the end of the spring that sits on the spring guide with a color. either enamel or epoxy. it would not only show you the spring rating, but also which end faces back.
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Weapons Technician / Gunsmith
Don't look at me, I don't know, lol ¯\(°_o)/¯.
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