The 25-year-old arrives at The Hive on a loan deal that will see him with the Bees until December 31st 2018.
He has featured 11 times this season for the Robins, 9 of which coming in Sky Bet League Two.
He was a summer arrival at the Gloucestershire side following an impressive season for Hayes & Yeading United in 2017/18 which saw him score a club record 39 goals, 33 coming in the league.
Duku was born in the Netherlands and this is where his career began with spells at VV Eemdijk and FC Breukelen before he moved to England for the start of season 2015/16.
The forward spent time with Chesham United before moving to Kings Langley, establishing himself as a regular in the side that won promotion to the Southern Premier.
He will be available for selection for tomorrow’s National League fixture at home to Solihull Moors.
Welcome to Barnet, Manny!