Not sure on the poly lower but the DPMS upper is not bad for the price. They are pretty darn accurate out of the box also. what polymer lower do you have? I'm guessing its a bushy.
Thats a awesome price man. The only thing I dont like about the DPMS uppers is that a lot of their barrels are not chrome lined and they are made of regular chrom-moly steel. Not sure if its true but I have heard from a number of people that they have a low life span. You should look into Rock River uppers also.
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