AR15 Lowers & Uppers-D S Arms
if it was me wanting to build a high end ar-15 on low buck budget. i would get that $275 nitrited upper from DSA. or maybe that 1-7" twist in chrome lined. then i would order the $100 m-16 bolt& carrier and $15 charging handle form Evil black rifle girls.
but if you want a regular upper with no chrome the JSE upper is tough to beat. not as good as those with the mis-matched gas tubes. but pretty good prices non the less.