I already have an AR http://www.xdtalk.com/forums/trading-post-sale-trade/77686-wts-loaded-ar-15-ks.html Should I buy a 6.8 barrel/Bolt/Mid-Length Gas tube. Or continue to sell this for a DPMS .243 (lightweight) I have alot of .243 brass already. Currently have another .243 bolt gun. I love the round. What will be the pros and cons of each round?