ADL doesn't have a hinged floor plate and must be manually emptied by cycling the action.
Is there an option to add the hinged floor plate post-purchase?
It could cost more than $200 to have the stock inletted and the parts for hindged floor plate. You could go one better and have CDI inlet the stock for their bottom metal (free) and spend $200 for detachable mag bottom metal. Of course Accuracy International mags aren't cheap, but they are more user friendly than a hindged floor plate and very very tough.