I have bought MAS Defense barrels and other parts with excellent results and this was no exception. Been building my own uppers but for the price and quality this upper could not be beaten. Fit andfinish was spot on. Mated tight to my lower and I had it zeroed at the range in just a few shots with nice groupings. Gassed perfectly as well. Even with the 15" handguards, this upper weighed in right at 6 pounds, one of the lightest I own. I'm sure I will be back at MAS for more stuff.
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