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Barrel ports just damage the rifling and make swiss cheeze out of the accuracy.
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The HK MP5SD uses a ported barrel inside the suppressor. It serves two purposes. First, it makes the gun/suppressor overall length shorter and second it slows a standard 9mm down to subsonic velocities.
I also have a Ciener manufactured suppressor on my Walther PPK. It uses a longer barrel (about 4" longer than normal) that is perforated and threaded. This supports the suppressor while still using the entire length of the suppressor to dissipate the gases.
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