MAC looks at the Daewoo(now S&T Motiv) rifle imported from South Korea. It's selector switch was designed with 4 modes - safe, semi, 3-shot burst, full auto.
South Korean military is looking at the next generation rifle, but for now, there are some limited number of K2C rifle. K2C rifle has AR buttstock adapter, Picatinny rails on top. The rails are supposedly monolithic