Well, I have been thinking of putting together a 6mm Hagar in an AR platform, and have recently put together a fast twist 22BRX, which I plan to work up loads for this spring. The idea of shooting the 90 Berger and other high BC .224 bullets got me excited. So, I was thinking, wouldn't it be cool to get the same performance out of an easy AR set up. I thought of the Hagar, but of course the Grendel case would also be an option. Anyone know of this being done by someone already?