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yes, your out of luck.
the 416 upper has a piston system, the M4 and other AR platform have a gas tube, which is significantly smaller, piston is bigger, and if IIRC all the 416 have a rail system fore end.
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"Lieutenant John Chard: The army doesn't like more than one disaster in a day.
Bromhead: Looks bad in the newspapers and upsets civilians at their breakfast." - ZULU (1964)
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