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I have a Bersa 9mm Ultra Compact with a 3.6 " barrel and I want to change the barrel to 4.2 " .

Would I need to change the spring because of the gas expansion in the longer barrel ??

This combination should give me better accuracy with a shorter frame - of course, the barrel will stick out the extra .6 " from the frame, but that won't bother me.

Any thoughts ??
 

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I would be surprised if roughly 1/2" of barrel would have any difference in the performance of the pistol.

Just call the manufacturer of your pistol and ask someone who knows for sure.
 
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