A british SAS specialist thinks that russian ZSU-23 is a 3-barrel 50-calible machinegun carted around in the back of a pickup truck.
In fact ZSU-23-4 Shilka is a Self-propelled Antiaircraft Complex (Zenitnaya Samokhodnaya Ustanovka).
From an outside it is a tracked vehicle with a turret kind of like Abrams tank only bigger with four 23mm barrels (hence "23-4") and a huge radar dish on top. In fact the standard AA shooting mode is completely radar-controlled.
It is an extremely powerfull weapon but it has maximum slant range of 3,000 meters, not 4,000 yards. No 50cal weapon has 4,000 yards effective range.
It should be is a bit hard to confuse with a small 3-barrel machinegun.
I guess his story got a bit distortrd in the translation...
miko