Just don't get the point of it... The 5.7 round makes a cool pistol, an interesting PDW when SBRd but the civi available ammo only from once source is sorta questionable, and you end up with a full size AR platform with only a portion of the ARs 5.56 ballistics.
In the PS90 it makes sense, but I saw the 5.7 upper on the wall of my local Fun shop today and I was left wondering what the appeal would be, why one would seek out this caliber to shoot in anything other than a PS90 or 5.7 pistol seems odd to me. $60-70 magazines, etc...
Yeah I just don't see the appeal.
Though I would apply this viewpoint to a 9mm AR as well... Just doesn't make sense.
Well I suppose if they were SBRd the AR 5.7 or 9mm makes some sense I guess, maybe i am just missing something.