Im picking my dpms panther bull on friday that ive been paying on for the last 4 months. But now Im wondering. Its a .223 rem cal. not the 5.56 I read that the 5.56 can take the 223 but not vice versa. Also can I expect the same price and availability as the 5.56. Would I be better off changing my mind and going with a 5.56 rifle? Its still not to late for me to change my mind at the gunshop.