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A review of the archives here reveals that earlier Mini-14's had 1:10, then they went to 1:7, then backed off to 1:9. The year of manufacture is the most important.
When I get a thin dowel rod to run through the bore, then I'll determine the twist rate as a previous poster suggested. Put a tight fitting wad over the rod and measure the how many inches it takes for the rod to turn one revolution.
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