well you must make a method for the reloading prosses and in the same method chech if the user has shot 6 times use a number variable under the World Properties tab.
So you might use a while loop to repeatedly check with an If Else statement, but instead of just (If TRUE do this or that, else do nothing) you might use ( If world.Stop is = 6 then) and methods would follow to show your animation for reloading the revolver. if you need more help I'll be checking regularly...