I have a question about XM193. Just saw some at a decent price at Firearms For Sale (http://www.firearmsforsale.com/federal-cartridge-co/ammunition/xm-223-remington-5.56-nato-boat-tail-metal-case-55gr-20box-25case/) but I was concerned by the note regarding "XM" ammo.
Product Description:
The XM ammunition is Metric caliber ammo that is contract overrun material, It may not meet all of the mil-spec requirements, however, it does meet all requirements of commercial amunition for pressure, form, fit and function.
It was my understanding that this was all mil-spec ammo?