My 300 BO Magpuls shoot 55gn .223 rounds with no problems.
I make it a point not to take AR's in multiple calibers to the range. While it is convenient for people who don't shoot much or live far from a range, I have seen a couple of blow ups and don't want it to happen to me.
I make it a point not to take AR's in multiple calibers to the range. While it is convenient for people who don't shoot much or live far from a range, I have seen a couple of blow ups and don't want it to happen to me.