The barrel on a Bryco Model 59 .380 caliber pistol cannot be replaced with a 9mm barrel because they are different dimensions. The internal components are also slightly different due to a difference in caliber.
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None of the Bryco barrels can be replaced because they are physically part of the frame, which is NOT even steel, but some other alloy in their case. It may make for more accurate shooting, but then you also can figure out why they wear out quickly.