I do believe I would go with the AR15 on this patrol. I assume it is sighted-in and dependable. Also assuming a 1:9 twist, 69gr Match would be my ammo. I understand completely the romantic attraction of putting an M1Carbine into service, but the ballistics, reliability, ammo choices, magazines and effective range of the AR are simply superior. If the AR had been available in 1942, it would have become the 'Light Rifle' the Ordnance Dep't was looking for.