I love my Bushmaster Predator, the most accuarate gun I own, but you have to pay alot of attention when sizing your brass. I'm still leaning towards the 450 Bushmaster upper.
Sure it's not DPMS? DPMS made some for them already to include Remingtons submission to U.S. Army for the SAS (Semi-Auto Sniper) Rifle. I have a prototype (from a friend at Remington) that DPMS made for them in 6.8mm.
NEVER MIND. Made a phone call and your right. Company that bought bushmaster bought remington 6 months ago and they are making it.