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    m400 ubpper Corten A Steel Supplier

    M400 upper sale Topic SIGforum, m400 ubpper A discussion , m400 ubpper Jan 06, 2018 · The upper is different, has Sig engraving on it and a square forging mark. My old upper is a cerro (keyhole). It does not appear to have the same surface treatment on the inside that the older upper had, for whatever that is worth.[plate]m400 ubpper Corten A Steel Supplier[steel]M400 upper sale Topic SIGforum, m400 ubpper A discussion , m400 ubpper Jan 06, 2018 · The upper is different, has Sig engraving on it and a square forging mark. My old upper is a cerro (keyhole). It does not appear to have the same surface treatment on the inside that the older upper had, for whatever that is worth.[plate]m400 ubpper Corten A Steel Supplier[steel]M400 upper sale Topic SIGforum, m400 ubpper A discussion , m400 ubpper Jan 06, 2018 · The upper is different, has Sig engraving on it and a square forging mark. My old upper is a cerro (keyhole). It does not appear to have the same surface treatment on the inside that the older upper had, for whatever that is worth.

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