An originalist reads the exact words in their original context. You have to look at the militia system as it existed in 1791. The country's defense was entrusted to a universal militia, which included practically everybody who could bear a musket (obviously, at the time, this meant white, free, male adults). But in other words, the "militia" was synonymous with the "people." That original militia system had fallen into disuse by the time of the War of 1812, so today it's a theoretical construct. Nevertheless an originalist judge would interpret the 2nd Amendment in that light. Bottom line: to an originalist, the general public should be as well armed as the standing army. Certainly Scalia was not an originalist when he was writing in the Heller case.