Ok, this works with anymap which has water, not at the edge of the map kinda schitt...
ok, lets take berlin for instance, grab urself a bazooka and head on down to those stairs leeding into the water.
Now run into the water but as you do so fire your Bazooka just before it dissapears.
Run into water + fire bazooka = in water with no gun.
Now walk/run back out of the water up the steps and as your bazooka is reloading hit the number 2 button to switch to pistol.
Now heres the fun bit
at the moment your holding your pistol and your bazooka will automatically reload its self if u switch back onto it,
so all you have to do is quickly switch from both pistol to bazooka quickly firing the bazooka and switching back as you reload again.
(Ultimate ammo).
With the right relfexes it looks pretty cool and you can fire quicker than a katyusha
p.s the only downfall however is that ur altered bazooka does not halm anyone nor any other tank/jeep or plane but it looks awsome!!
PhhhEwwww!