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Vz.52/57

What is the difference between the Vz.52 and a Vz.52/57? The 52/57 is the rechambered version, now able to fire 7.62x39mm. They also use a different style magazine with a slightly more angled floor plate. The 52/57 rifles are kind of rare and much more collectable since they use the easy to find ammo. Price for can range from $650 to $900 depending on condition and how many magazines it comes with.