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i have the same barrel in my vfc m4. i have a 16 inch barrel and i have a 407 hybrid tight bore and i love it. and as mentioned, a bitch to install in the hopup.
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Load Out:
Primary: Modified VFC M4, Echo 1 M249 Para, Modified Magpul M4
Secondary: TM Glock 18C, TM Glock 17, KJW M9, WA M9
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