I just picked up al barrel marked CAI M14icon S/A shorter that has the chopped and welded flash hider. I believe it is a Norinco or Ploytech M14 as the barrel is marked made in China and not the Federal Ordinance made receiver that CAI used on some of the M14 Chi Com's. In the process of dremeling the castle not and chopped flash hider I got into the castle nut. I believe the castle nuts are metric. If anyone has a metric castle nut they are not using let me know.
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