I had a coach I mentor ask me about kisser buttons and I did a Google search to find pictures I could refer him to. To my horror, a “kisser button” search came up with a large number of photos of compound archers using a kisser button with a peep sight. You do not want to use a kisser button with a peep sight! Let me explain.
A kisser button is either a tied-on plastic “button” or a large knot of thread (some even use a simple brass nockset) designed to be felt by the archer’s lips at full draw. Since the draw is determined in the back and the anchor position of the draw hand determined by the bones of the jaw or face, the kisser button helps to orient the archer’s head. If the archer’s head is not straight up and down (or at least consistently oriented), she will get left and right and even up and down errors, aka larger groups.
Kisser buttons are largely used by Olympic Recurve archers if at all.
Compound archers, using sights, are allowed a peep sight, which is a lozenge inserted into the string which has a hole in it that allows the archer to look right through the string (see photo below). Again, the draw is determined in the back (and also by the setting of the draw length in the bow) and the anchor position of the draw/release hand determined by the bones of the jaw or face. The head position is determined by the aiming eye being able to see through the little hole in the peep. Of course, the peep has to be set up correctly so this is possible.
If the compound archer has both a peep and a kisser, he has two references as to having correct head position. That should be good, no? No. Consider the situation if either reference is set up incorrectly. Your archer will have one indicator saying “Here!” and the other saying “Here!” with the two positions different. Consequently he will most likely be switching back and forth between the two or finding some ill-defined middle position. Surely, you say, that can’t be a big error? Well, errors of rear alignment are larger than errors of front alignment (just because of the angle of the arrow) and compound archers generally shoot smaller groups, so in this context, even a small aiming error can cost your archer significant points.
What if both references are set up correctly? No problem there, right? Yes, problem there. On level ground there would be no problem (also not much benefit) but in field archery where uphill and downhill shots are common, there is a new problem. When shooting up- or downhill, you are to tilt at the waist to keep the upper body geometry the same as for level shots. Unfortunately, it is easy to say that but hard to do. Most archers tilt at the waist but also tilt at the shoulders a bit. This means that the bow is in a different position than in a level shot but the aiming eye must be able to see through the peep so if the bow is lower, for example, the anchor position must be slightly higher (and vice-versa). Everything rotates around the peep being exactly in front of the aiming eye. But, if the anchor position changes, so does the kisser button position and once again we have the peep and the kisser providing “mixed messages.”
Archery is hard enough as it is. Don’t make it harder by recommending both a peep and a kisser button to your compound archers. One or the other suffices (with the peep having far more secondary benefits).