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The M4 and M16 have the same nozzle, only different cylinder lengths and they sometimes vary in whether their battery is stored in the front of in the stock. However the M16A1, M16VN, CAR15 and XM177 have the same nozzle but it's not the same as the M16A2/M4A1 nozzle.
Perhaps the site your looking at just puts down one type of gun per nozzle for some reason and so the same nozzle is listed several times?
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