Accuracy through airsoft

I recently picked up an airsoft gun not expecting much, just something for target practice at home. I had been told that the newer models have fully functioning features same as the model they are replicating, this is a great thing to have for at home training. Right out of the box it shot a 4in group at 10 meters without any adjustments, this is incredible accuracy for a gun costing less than a hundred dollars. This gun runs on propane (green gas) and shoots plastic bb's making it very affordable to shoot.