Board Thread:Tutorials/@comment-5885957-20121218102627/@comment-31.54.124.147-20130116121431

A better way to do this is to place an archangels smite in the dispenser with a good emc source. A redstone signal will cause it to fire a arrow that will track down nearby players and mobs. this means you can use a few dispensers firing arrows which will nearly always hit, instead of a wall firing lots of ammow, most of which will miss anyway.