Factory 10-round .45 ACP magazine with a flat floorplate for the HK Mark 23.
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HK sells this 10-round magazine as a spare for the Mark 23, with a flat floorplate instead of the standard pistol's 12-round configuration. The commercial Mark 23 ships with 12-round magazines, so this is the factory route for a 10-round-limit state or a shooter who wants the shorter, flat-bottom profile.
The Mark 23 uses its own magazine pattern. Do not substitute USP45, HK45, or HK45 Compact magazines, which are separate HK families.
Add the HK Mark 23 10-Round Factory Magazine to your build and see how it enhances your platform.