New M249 PIP does not have a mag feed option (thank god)
The C9A2 project is dead -- when Diemaco was sold to Colt, and became Colt Canada - the rights to produce anything from FNH disappeared - Colt is an FN competitor - and FN was not allowing its TDP for the C6 and C9 to remain there.
*yes genius to allow that to happen - so Canada will get no new parts from Diemaco/Colt Canada for those guns - nor barrels etc. (rocket science)
The A2 barrels where an annomoly as they where just chopped C9 barrels -- they had the C9 flashhider put back on after the barrel was recrowned and threaded. The Mk46 and M249 Para have a different thread and different flash hider.
The A2 stock was a copy of the Stoner 63 stock in the folding mechanism - and the standard C8 stock added -
- the US via FN now makes a Para stock like this - but with a checkpiece to improve the fit. (without the folder ability).
Not a lot of sense to buy a new C9 now -- the CF ones never had the hydralic buffer from the US M249 contract (which is why ours wore out at less than half the round count...) Your better off buying a Mk46 - as it has an intergral RAS - and getting an extra Para barrel (they are heavier) - it has no mag feed option (a good thing IMHO).
However the M249 has always been a "disposable machiengun" - they have a short service life due to the design.