Im in process of building an Ar Ive got lower completed.A couple of questions.which caliber would I get more use out of .308 or 6.5CM.I want a shorter barrel 16 or 18" which length would be better.I would like something versatile to fight with,although i dont see that happening and something that will reach out.For an optic I already have a Leupold 2.5-8X all I need is something around the ring that adjusts power from 2 to 8 something easy to get ahold of.Any thoughts
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