I had an Stag Arms AR in 6.8 for a couple of years when i found out Ruger was making them. Never got a chance to buyna Mini in it though. I bought the last Hawkeye 6.8 Davidsons had back in 11 and have a bunch of fun with it. I traded jnto a Savage a planned on a barrel swap but I haven't found a stock that I like to fully commit to the swap.
I sure wish Ruger would do a American Ranch in 6.8, but I bet it will never happen.
I do plan on a Thompson Encore barrel in 6.8 so I can suppress it.