Recall on the ACR.
http://bushmaster.com/pdf/ACR-Web-Notification.pdf
Glad I didn't bet my $2K+ on it.....
This is not surprising with a new platform, but come on. How do you miss that during the design/testing stage.
I havn't found a better deal in my opinion on an upgraded ar platform rifle than the sr556, except maybe one from lwrc which is more expensive but probably worth it.