I have a Mossberg 500 20 ga that does not fit me very well. When the gun is in it's natural shouldering location, my line of sight is far too high. The mid pin appears about 1/4" lower than the front pin. As I understand it, this is partly length of pull as well as comb height. In any case I learned real quick that jamming my face lower was not a good idea! It's an interesting feeling having shotgun recoil jar your head. What can I do to fix this? There are not many stock options for Mossberg 500's, especiall in 20 gauge. My guess is either make a new stock or deal with it. In a quick 10 minute search I haven't come across any products to lengthen pull (slip on covers are not acceptable for me). Until it's longer I can't tell if that will be enough to make me happy, or if it will be too long to shoot well.