I've got a neighbor who is now shooting my old 391 Gold Teknys trap. He is worried about seing space between the beads. Maybe I can answer the following questions for him. 1) What is the POI of a Teknys Gold Trap/30" barrel ? 2) If he wants to reduce the space between the beads, which direction does he have to move the comb? & Finally the gun has an adj butt plate.