I think that they probably mean that although in existence, the P14 wasn't allowed in the NRA Service Rifle competition until that date.

As to "extremely inaccurate", accuracy like beauty is often in the eyes of the beholder. In other words it depends on your benchmark. The SMLEs did very well against the competition in the HBSA Fixed Bayonet shoot at the weekend. Once again, the nut behind the butt being the most important component.
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