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The parts are all fully interchangable, but the size is what's going to get you. On the Mk II, I'd ASSUME - and they say where that gets you - but I'd assume it'd be the same as an M16 cylinder since it has no ports in it, and a regular version 2 cylinder head since the Mk IIs barrel is about on par with the size of an M16 barrel.
The air nozzle might be a tad trickier - they could've used any kind of nozzle for it. But it'd make the most sense that CA transfered parts from the M15 series for the internals in the M249, since they'd be readily available and they wouldn't have to retool their machines and make completely new parts for a single line of guns.
On the Para version, I would safely bet, the cylinder will probably be ported since it has basically an M4 inner barrel, so it wouldn't need the compression the Mk II is getting, so the cylinder there would probably match with a TM or Systema M4 type cylinder.
Hope this helped.
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