Plastic?????? yes!!!!! - American Tactical Imports AR-15 Stripped Poly Hybrid Upper Receiver

Material is extremely high quality manufacturing and assembly of that top notch I cannot say enough very easy to assemble lightweight good looking product made a very good match to the ATI lower that I already had easy to finish and install on any lower using any barrel no Mars in the finish no flashing on the molding I'd have to say just as good as any of the aluminum uppers that I have assembled except that it's half the weight if you're looking to lighten up your AR this is the way to go be sure and use proper vice blocks proper gunsmith tools and remember to never over tighten the barrel nut or the buffer tube I would recommend using this on any future builds and I plan on doing several more using the ATI uppers and lowers