Glock Magazine Springs: M/21, 21SF, Wide 10 Coil
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FIND SIMILAR PRODUCTSThe GLO-1300 G21,21SF 10 coil wide base magazine spring is intended for use with the 1304 or 1304-3 follower only. Not intended for use with old style NFML magazines. Part number 34 on the Glock Schematic.