I have an olympic arms ar with a fixed carry handle. I want to switch out the upper to one without the carry handle (flat top, picatinny rail). I want to use the barrel i already have, but remove the standard front sight post and replace it with one of those picatinny gas blocks, to mount a folding buis that wont obstruct the LOS of the optic. Does anybody know where i can get the parts/labor from on the cheap? Or is cheaper to just buy a complete upper?



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