Re: seekins 20" build. (need feedback) Well, here's my story -- so far so good. We'll see. I just ordered a Seekins complete build today. An upgraded CBR -- iRMT-3 upper and 15" SP3 rail, SSA-E trigger, 16" SS match barrel, Ergo delux grip, Ace fixed stock (8.5"), 223 Wylde, SP ATC pinned...