Holy @$% this is the best manufactured, highest quality components ever combined to make a super mk-12, forget about the rest, BCM is the best, hands down!!!!
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Excellence
January 5, 2012
Reviewer:
william sartin
from clarksdale, MS United States
I've had this upper almost a year now. I've run Privi partizan 69gr and 75 HPBT through it which both averaged 1/2 Moa. With Southwest ammunition's Run N Gun 77gr SMK's i've got one 3 shot group right below 1/2 Moa and then another that i shot which is the best three shot group i've ever shot in my life at 3/10ths of an inch. I know 3 shot groups are frowned upon but thats more or less a shooter test. Fact is this rifle will group. BCM makes a quality SS410 barrel, i couldn't be happier.
OMG 
