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Does A Heckler & Koch MP5SD Turn 9mm Into 380ACP Ballistically? Let's Find Out!

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1m Oct 25, 2021
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People often say that the ported barrel of the Heckler & Koch MP5SD that allows supersonic ammo to be fired at subsonic velocities essentially results in 380ACP ballistics... But is that actually true? 🤔

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I do reviews of firearms and related gear. I'm a graduate of the Massachusetts Criminal Justice Training Center and I've served in the USAF as well as the US Army and have experience on a pretty wide variety of small arms.


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