This unit adds capacity to Generation 4 Sub-Compact, Mid, and Full Size Glock standard capacity magazines. This magazine extension replaces the original floor plate and internal locking plate and adds two rounds to a 9mm; two rounds to a 40SW and 357SIG, and one round to a 45GAP magazine.
This unit will not fit the 10mm or 45ACP mags or 10 round G17, 19, 20, 21, 22, 23, 31,32 mags.
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