I just bought and love the feel of the wilson combat 320-cmt that i just put on my p320 m18. however, i noticed with the 15rd mag inserted, i hear a clicking noise when walking with gun on or with movement of gun. with the 21 rd mag it doesn't seem to click but the mag does rattle in the grip. almost like the grip is not tight enough in the top section allowing room for the mag to wiggle. is there a solution for this? thanks for any and all input