Yes, This is Lake City ammunition. There are two companies that supply from Lake City ammunition plant.
The most common is from Winchester. The other is Remington. Ammo that's 5.56 labeled (NOT .223 LABELED!!) from these two suppliers are LC headstamped.
Please don't use ammo labeled 5.56 in a rifle or barrel that's labeled .223. You may have a great big KABOOM that could endanger your safety, your body, and even someone else that's in close proximity.
Lake City 5.56 cases are stronger than .223 cases.
I doubt it. They're usually pretty proud of the Lake City stuff.
I bought some in June 2022. They are headstamped LC 22 with the NATO mark.