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Kamara moved to the Essex club over the summer.
He joined Colchester on a six-month deal but struggled to make an impression.
And the club have now confirmed midfield man Kamara has returned to Arsenal.
He made six appearances in all for the U’s – but just four of those came in the league.
The Finnish youngster last turned out for the club in November when he started in a 3-0 home defeat to Leyton Orient.
Kamara’s return to Arsenal comes on the same day Jon Toral joined Ranger for the rest of the season.
The Spaniard has moved north of the border on a loan deal which will see him reunited with Mark Warburton.
The two worked together at Championship side Brentford and Toral will be hoping for more success in Glasgow.