You may have seen one of Weta’s full-scale District 9 gun replicas in the past, but those don’t come cheap at $499. However, the company has recently launched a line of highly-detailed 1/4 scale replicas that come in at a more reasonable $99. The assault rifle is first on the list, but I would expect other models to follow soon. Better hurry though—only 750 were produced and even the large scale versions go fast.
Speaking of that, if you don’t mind shelling out full price for the full scale models, the Gas Projector is still available.