After I finish my current project its on to another SBR. I currently own a 16" Rock River AR. This time it is going to be a factory SBR. I'm down to three calibers, 300 Blackout, 6.8mm or just stay with .223/5.56. Which is a better choice? Anyone have first hand experience with either one? Eventually wanting a silencer any differences down the road when I decide to?
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