Armalite did make an AR-30 - it was a 30 caliber bolt action rifle, with a form similar to the AR-15. It was chambered in either .308, 300 Winchester Mag, or .338 Lapua Mag.
They also have an AR-50, chambered in 50 BMG.
AR-30...
https://www.swatmag.com/article/long-range-lightweight-lethality-armalites-ar-30-338-lapua-magnum/
So doubtful with the rapidity of fire that it was a bolt gun. And repeat shots with either the .300 Win Mag or .338 Lapua seems a bit out of the tranny’s league.