Factory 10-round .45 ACP magazine with a finger-extension floorplate for the HK45 Compact and USP45 Compact.

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HK HK45 Compact, USP Compact .45 ACP 10 Round with Finger Extension
This is HK's 10-round compact .45 ACP magazine, shared by the HK45 Compact and the USP45 Compact. The extended floorplate carries a finger rest that sits below the frame, which is how the compact grip holds 10 rounds; the flush compact magazine holds 8.
The HK45 Compact Tactical V1 ships with two of these, so a spare matches the pistol's as-delivered capacity and feel. Full-size HK45, USP45, and Mark 23 magazines are separate HK patterns.
Add the HK HK45 Compact / USP45 Compact 10-Round Magazine (Finger Extension) to your build and see how it enhances your platform.