CZ 455/457 5rnd +3 Extension

Add three rounds of capacity to your CZ 455/457 5 round magazine with the MKM CZ 455/457 5rnd+3 Extension.  Redesigned shape for increased strength and durability. Printed from  durable nylon 11 material on our state of the art HP Multi Jet Fusion machine. Easily installs in under a minute, simply remove baseplate and slide on extension. Extremely lightweight, lifetime warranty, and made in the USA! Reuses stock spring and follower. ONLY WORKS ON 5 ROUND MAGAZINES

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