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Hi, It really depends on whether you have the original barrel or your barrel was replaced sometime during its use (likely). Original M91-type rifles and carbines had gain twist barrels, however, this feature has been dropped since 1938 as a money-saving measure. So this rifle likely has gain twist barrel originally but if the barrel was replaced after 1938, it is replaced with a fixed twist rate. Your best bet to find some gunsmith to check it for you. I hope this helps.

William, the majority of these surplus rifles come with Fixed Twist Rate Barrels Sir. Cheers and stay safe!