I am not certain how you would know what length barrel came on the pistol unless you had the original box or a factory letter. You might be able to determine that what you had was a newer barrel, but still wouldn’t know what came with the pistol. I have a couple of period barrels that could have come on my M41s, only I know what was there to begin with and my memory is fading. I could swap barrels of the same length and still not know if it was original.
As for accuracy I don’t know why the current barrel is suspect.
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Ipsis Rebus Dictantitbus
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