Glock 21/21SF Mag Spring 10 Coil fits 13rd .45 ACP Glock magazine.
This Glock factory OEM 10-coil replacement magazine spring is for high capacity, pre-ban, or LEO Glock 21/21SF Wide Base factory magazines with a capacity of 13rd of .45 ACP.
Works with new magazines and old magazines with followers marked 1304, 1304-1, 1304-2, or 1304-3
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