Hey Fabs,
You may want to check out the below website-
www.dpmsinc.com as I have seen them advertise in alot of my monthly rags. I know nothing about this company's offerings but it does look like they manufacture an AR10 equivolant.
BTW- My brother also shoots a Bushy and I do think that they are accurate-having shot it on a couple of different occassions. Good luck and enjoy the process!