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The HK45 mags are staggered. They're the same diameter as the USP45C mags only longer. The fullsize HK45 mags will work in the HK45C as well as the USP45C. The fullsize USP mags CAN NOT be used in the HK45 nor can the HK45 mag be used in a fullsize USP. Mk23 mags and HK45 mags are completely different too.