Glock
Factory 13-round .45 ACP magazine for the Glock 21 Gen4 and Glock 30S

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Glock Gen 4 Glock 21 / 21SF .45 ACP 13-Round Factory Magazine
Glock G21 .45 ACP 13 Round Pistol Magazine, Black, 1 Pack, 13, 1098
The Glock 21 Gen4 factory magazine holds 13 rounds of .45 ACP, matching or exceeding the capacity of full-size competitors like the Springfield XD-M Elite (.45, 13rd) and exceeding the H&K USP (.45, 12rd) and 1911 government (8rd). The polymer construction follows Glock's standard OEM design with a steel liner.
The G30S uses the same magazine as the G21 Gen4; the shorter G30S grip accommodates the same magazine body with an extended portion that protrudes slightly. This magazine is .45 ACP specific and NOT interchangeable with Glock 9mm or .40 S&W magazines.
Add the Glock 21 Gen4 .45 ACP 13rd OEM Magazine to your build and see how it enhances your platform.