Originally Posted by bige91603
I live in PA and have built a few, as long as they are for personal use and not for sale it is totally legal. I go with 5.56 because I never know when I'm going to come across cheap milsurplus and I enjoy the occasional tracer. Theres also the .223 wylde that some say can use 5.56 but I'm skeptical
Another question you might want to ask is what bore twist do you want?
Don't be skeptical and don't be dead.
If your rifle is only rated for .223, DO NOT USE 5.56
There are tons of websites to explain why.
Just don't do it.
Make sure your chamber and barrel are marked 5.56 and there will be no worries.