There is NO difference in the magazines.... they are identical. The 1991 has a minor change to the firing pin / hammer block design; but it's enough different that these parts will not interchange. Everything else is identical between the 1911 and 1991.
Colt 1911 vs 1991.
Is the only difference between the two the magazine capacity?
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Just as a matter of info, I believe you can remove the firing pin block and spring then use a standard firing pin.
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