Return to 10.5" 5.56 / .223 AR-15 BARRELED UPPER - MAS DEFENSE NERO 9.87" M-LOK RAIL - FDE

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First upper from MAS April 15, 2019 : Mike from Cincinnati, OH United States   The uppers came highly recommended from several people I know.  It is very well build.  It did not cycle Tula properly but I don't know if that's the fault of the upper or a lube issue or the fact that steel case generally has issues with tons of guns.  I can't give it 5 stars because of it though.  However, I may have a different opinion as I break it in.  The brass I shot cycled flawlessly. EDIT: I zeroed an optic with this upper a few weeks ago and it functioned flawlessly using 150+ rounds of 62gr green tip.  Rating upgraded to 5 stars. Was this review helpful to you?