Hi hitman1,
The VS gun is the most powerful airsoft that is fitted to the tanks.....it is better made and just fires harder, for longer...It always has...and it is a Direct Swap for the Heng Long etc.
It might be possible to fit a completely different airsoft gun...but its a matter of finding one of the hundreds that are made that will actually
fit into the turret. A lot of the 'toy / replica' guns are battery operated and use a separate magazine that is loaded from below like a machine gun. It uses a long coiled spring that is wound up and it enables the gun to hold about 100 rounds for the automatic firing.
IF and its a very big IF....you could find one that would fit then you could replace the tank gun in its entirety which would be very nice. I like the airsoft but I have a large garden and have no near by neighbours to get 'Upset'
In my opinion the airsoft aren't really dangerous, (only eyes are remotely vulnerable) and its a lot safer than an airgun or a catapult.
Never Forget......
The Propaganda of the Victors....... becomes the History of the Vanquished