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5.7 ammo is becoming much more difficult to obtain according to my friend who really likes that round. Of course, if the military were to use this round, then it would have to be non-expanding, so it would only be punching a .224" hole in the badguy. Since our troops are required to use non-expanding ammo, it does make sense to use ammo that punches a bigger hole in the target.

Beretta does offer the PX4 Storm line in .40 & .45 that was developed to pass the military's standards in sidearms. The 96A1 might pass, too.