I keep hearing conflicting info on the LC stuff, especially when it comes to the M855 marked "Not For Duty Use" and the same cans that dont have those markings.
But People say that IMI and Privi and even PMC X-TAC (South Korean) is genuine military ammo, because the rules dont apply to ammo from other countries.
I would buy whats cheapest, its all GTG imo
Edit: A rep from SGAmmo has said that the new 420 round cans of M855 on stripper clips that is NOT marked "Not For Duty Use", is just so Federal could get out of pricing contracts, so they changed the designation and removed the not for duty use marking.
But places like Palmetto are stating that it has passed all Government quality control is is not reject ammo like the cans that are marked (not sure how they can sell it to the commercial market though????)
So there is conflicting information all the time, I dont think anyone knows, or can get a straight answer from federal