im starting to look at national match shooting. i want to buy the DPMS upper but i have a couple questions first. is the front sight windage adjustable? would it be cheaper to just build one up from the upper i have now? creedmoor has sights i can get for about a total of 180ish and the DCM legal float tube is 75 but ild have to get all the tools which is about another 100. not to worried about the barrel for now. i figure it wont make much of a difference til i get more serious about the sport. the total for the DPMS upper is right around 600