lunatik, the chance of anyone here having the answer t othat is very unlikely. both tanks a re very very classified. i will not tell you what the avarage time for a merkava mk4 crew to fire their first round at a target, but i will tell you about the Mk2 since its not classified. it is about 10 seconds, and good crew do it in 7. in 20 seconds usually 3 rounds(this is based on me doing this as a gunner, as a loader, and as a commander). now iamgine that the Mk 4 has far better fire controll, has higher sights, and so on.