This metal replacement magazine catch fits all M1911 MK Series and M1911A1(2014 model) pistols that carry a 21 round magazine. On respective diagrams, this may appear as part 409, 17, or 344. If you are using a 14 round magazine and would like to start using the 21 round, double stack magazines, you'll need to purchase the double stack slide catch as well as the double stack magazine catch.
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