Wanna know a cool thing about those mags?I second this place.
CZ 40P, CZ P-06 or CZ SP-01 MAGAZINE BASE 0430177001 [CZ SP-01 BASE PLATE 0430177001] - $8.95 : Greg Cote LLC
Greg Cote LLC CZ 40P, CZ P-06 or CZ SP-01 MAGAZINE BASE 0430177001 [CZ SP-01 BASE PLATE 0430177001] - CZ 40P, CZ P-06, or CZ SP-01 FACTORY MAGAZINE BASE PLATE 0430177001. THIS BASE PLATE CAN ALSO BE USED ON THE MEC-GAR OR CZ FACTORY CZ 75B 16 ROUND MAGAZINES TO MAKE EXTENDED MAGAZINES FOR THE CZ...gregcotellc.com
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They will feed both 9mm, and 40S&W.
Joe