Invented only two a long time apart, the 9mm Luger/Parabellum and .45 ACP have already been rivals in the world of semi-auto pistols at any time because.Besides the MK23 that was adopted from the SEALS inside the 1990s, their resolute HK45 (guess what caliber it really is chambered for) has become singing the tune of John Browning for over ten year