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Discussion Starter · #1 · (Edited)

I haven't seen many barrels for sale over the last year or so for my HK 51, therefore I purchased a spare on this board from an HK 91 to be cut down in the future. The barrel is German and has an S, then IA H5 stamped on it. Does anyone know what this coding means? Most of my NFA weapons are IB or IG, which I know means 1981 and 1986 respectively. Not sure what the S or the H5 means.

Thank you,

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