By David Crane defrev (at) gmail (dot) com November 19, 2011 A two days ago (Thursday), DefenseReview (DR) received a heads-up from our friend Rob Silvers at AAC (Advanced Armament Corp.) about SIG SAUER offering a 300 AAC Blackout (300BLK / 7.62x35mm)-version SIG516 (also written SIG 516) gas piston/op-rod (push-type operating rod) tactical AR carbine
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