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NO, HK45 will ONLY USE HK45 magazine. Unfortunately, Neither USP or Mk23 mags will fit into the mag-well of the HK45. This mag is out of stock everywhere so keep an eye out for when it is back in stock ( https://hkparts.net/product/hk45-hk45-tactical-13-round-magazine-p18387.htm ) I hope this helps.