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Violent Crime Control and Law Enforcement Act of 1994, https://www.govinfo.gov/content/pkg/BILLS-103hr3355enr/pdf/BILLS-103hr3355enr.pdf

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McCollum, Ian, Krummlauf Curved Barrel on an StG-44, Forgotten Weapons, www.youtube.com/watch?v=HSsFiS2Voxg

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