Yes on how to assemble AR-15, I've done several but I seem to run into another type of problem each one. Most built from individual parts. Last one and still pending has same problem as Frogmans. Getting right Barrel Exstention for correct alignment of barrel to the upper. It should be mentioned that they do come in different index pin clock alignments So yes this is good idea. So us back street builders have some idea to what is right.
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