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    Lynnwood, Wa
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  1. I have nearly completed my 1st AR-15 build. Upon attempting to install the upper on my poly lower, the rear takedown pin will not fit correctly. It is like the provided holes in the lower are too far apart to allow the upper to pin into place. I have tried the rear pin first with no results. The pin is roughly 1/16" too far forward to pass thru the left side of the lower. Does anyone have any history with a poly 80 and this issue.? BP