A physical first-half battle saw the visitors edge ahead with an Adam Larkin penalty before Ryan Constable’s converted try on the stroke of half-time gave the score a more realistic look.
However, it might have been different but for three squandered penalty shots from home outside-half Ally Warnock.
Instead the Irishmen stepped up a gear after the break and put the issue beyond doubt with a trio of touchdowns in quick succession, all converted by Larkin.
Constable notched his second while wingers Tyrone Howe and James Topping were the other Ulstermen to breach a ragged Edinburgh defence.
There was still time for Constable to complete his hat-trick with the best score of the night, converted by Larkin, who rubbed salt in the Gunners’ wounds with a late penalty.