Versatile midfielder, Moore, 19, slotted in at left-back as Peterhead romped to victory at Balmoor.
Martin Bavidge, Bobby Mann and Konrad Kozminski grabbed the other goals for the Blue Toon.
Gunn first came to attention as a 16-year-old striker playing for Wick Academy in the Highland League with a prolific goal-scoring reputation.
The 21-year-old striker has been on the fringes of Ross County's first team for the past two seasons.