Hey guys, im new here and just got my stamp and made a Sig 556 into a rifle-sooo, noticed 2 problems right off the bat-I need a sig Diopter rear sight-which is nowhere to be found. I have looked on this forum at the alternatives but they seem pretty old and most of the vender websites are gone-any suggestions? Also, mounted my stocked lower and learned that the hole that holds the folded stock to the right side will mate up with the nub on the fish scale hand guard but will not stay locked? Any suggestions? Is this a common problem? Thanks, C