Cameron Peupion grabbed a brace as Arsenal were put to the sword by Albion’s under-18s on Saturday.
Albion took time to grow into the contest, but once Levi Laing put one past his own goalkeeper after 25 minutes, the visitors didn’t look back.
Australian Peupion, who joined the club in August, fired into the bottom right corner from the penalty spot to double Albion’s lead, before Todd Miller added a third just before the break.
Andy Moran got Albion’s fourth on the hour mark, before turning provider late on as Peupion netted his second of the afternoon in the last minute.
The result moves Albion up to sixth in the Premier League South table.
Professional development phase coach James Baxter said, “Results-wise we haven’t quite found a consistency, but our performances have been really good.
“We’ve been on top in a majority of our games. We just haven’t had that clinical edge, but that came together on Saturday. We have won two, drawn two and lost one so it’s not been a bad start.
“We’re averaging 15 chances a game at the moment and kept a clean sheet on Saturday so it was a dream game for [Head Coach] Mark Beard and myself.
“Their attitude and the way the players conduct themselves has been phenomenal whether we win or lose. They are such a hard working group and the result against Arsenal saw the fruits of their labour.”