I have a Caspian single stack in .40. The Metalform 9rd 10mm mags work just great. I have also found that Wilson 8rd .45 mags work well also. The Wilson's will hold 9 .40's.
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John
"And by the way, Mr. Speaker, The Second Amendment is not for killing ducks and leaving Huey and Dewey and Louie without an aunt and uncle. It is for hunting politicians like (in) Grozney and in 1776, when they take your independence away".
Robert K. Dornen, U.S. Congressman. 1995