Good value - Radical Firearms Upper Assembly 7.5 inch 5.56 M4 Contour, A2 Flash Hider

If you are looking for top quality or perfection, look elsewhere. If you are looking for a good upper that you can use without concern about scratching the finish or what have you, then this is the upper for you! Granted, it's not as tight of a fit as a higher quality build but it functions just as well as my higher quality builds but at a fraction of the price. You probably won't have the tightest grouping but you're most likely not building a pistol for long range accuracy. Overall, I like the setup and by far the best price I've found.