I had never owned an AR-15 and was curious about how accurate they might be. After a little research I purchased a Colt HBAR Elite with a 24" barrel. I found that this rifle with 69 grain Match Kings and Varget powder will shoot 3/4" groups at 100 yards. I would like to shoot this rifle with iron sights but am confused about what will work. The front sight seems to be especially problematic. I am sure we have some folks on the forum that are far more knowledgeable than I about these rifles, any recommendations?