Glad you are okay. The BCG and barrel are quality parts. I'm thinking something was wrong with the ammo, or excessive headspace maybe?
Don't even go there... this board has proven with extensive scientific testing (aka "I've never had a problem") and the requisite subsequent public ridicule that headspacing is not necessary, nor recommended or indeed should even be considered by those who want to learn more or be extra special safe and thorough for their own education or peace of mind.
Jus'sayin'.