In terms of safety features, both the M400 and M600 feature an embarrassment of riches: a side-mounted external safety, a grip safety and a magazine disconnect. The Parabellum, it should be noted, is loaded to higher pressures. It was designed in 1901 by Theodore Bergmann and features a case length of 23.11mm, as opposed to the 19.5mm case of the vastly more successful 9mm Parabellum. The 9×23 Largo, in service trim, featured a 127-grain bullet at close to 1,200 fps, which is reasonably close to the original 130-grain. This isn’t much of an issue with the standard pressure 115-grain FMJs we used in the 9×19 M600, but it was a bit more appreciated in regard to the slightly snappier M400 in 9×23 Largo. However, the powerful recoil spring, beefy receiver necessitated by the straight blowback action and low bore axis make them very tractable as we discovered at our initial range session. Both the M600 and M400 have grip angles - while not exactly like a T-square - are somewhat similar to the Soviet T-33.
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