Notably, the Norinco and Polytech operating rod springs are slightly smaller in inside diameter than the USGI standard and most of the USA made commercial operating rod springs, an ORSG for use on a Canadian (metric) M14 clone, may bind on the larger outside diameter of the USA made operating rod spring guide.
The Black Arrow operating rod spring guide was designed to be slightly smaller in diameter to be compatible with both the larger USGI springs and the smaller internal diameter metric Norinco or Polytech springs. The M14.ca Black Arrow is the only ORSG in the marketplace with this unique distinction.
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