Your Browser is Outdatedcan this cover be used on 556 also says 223 — 2 Answers
Featured Answer
A .223 can be fired out of a 5.56 but not the other way around. They're essentially the same in an application like this where you're simply talking about the size of an accessory. Yes, it will fit your 5.56.
Featured Answer
Yes it will work with either. As far as the upper sizing is concerned, the ejection ports are the same size for 5.56 or .223