So long as the M16 is also ICS manufactured, the components should be interchangeable. If not, the receiver will not be compatible with the split gearbox design.
Something to note: your M4 will require a ported cylinder for optimal performance. It is not likely that your M16 had a ported cylinder on account of the barrel length.
Last edited by Anvil; September 27th, 2015 at 20:26..
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