I have a Lyman investarm GPR, I have it in the for-sale section. but if I don't sell it, after seeing Bob Woodfills video I am going to make it as real as I can to a Hawken, what is the correct sight? Do I go with i see a couple on track. I don't want to spend the loot for an adjustable so which fixed rear sight should I get? any help is apperceived,,,,,,,,,,,,,,,,,,,