Thats pretty much it. The military has been wanting to move to a caliber that would carry more energy, further, but didn't want to go through the expense of a platform change, or replacing magazine, and other parts. I also have an Arsenal SLR101s, but, wanted a larger caliber in the AR platform too. I had considered a 7.62X39 to share ammo with the ak, and sks, but I decided against it due to feeding issues it's known for because of the case shape. Yeah, ammo is pricey, but I am now looking into setting up to reload the 300BO that would bring the cost down to around .30 a round. Right now it can be found as low as .80, but can also go up over a buck. The caliber is still new, and as it gains support, it will be more available, and the cost will come down, but as of now, it is pricey. If it don't, and for some reason it craters (which I doubt it will because the military loves the round, and everyone that shoots it loves it), and ammo goes away, all I have to do us change the barrel, and I have it back to a standard 5.56NATO. I doubt the round will go away, it's been gaining more and more momentum. If it does, .223 brass is easily converted to accept a .308 bullet, which is pretty much what the 300 BO is. So, its easy enough to make your own ammo out of available stuff.