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Douchebaggery aside:
>5.7x28mm inferior to .223 in every way
>less ammo choices
>ammo is more expensive ($0.40 for plinkan ammo, $1 per round for defensive ammo)
>mags are expensive
>upper mangles brass, makes reloading brass impossible
>supposedly not very reliable
>non-bullpup layout, semiautomatic fire and full-length barrel negates all the advantages of the P90
Honestly, there are absolutely no advantages apart from lower recoil, and .223 is already very tame.