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Mini-14 580-series ammo?

3K views 5 replies 3 participants last post by  trailrider 
#1 ·
A Mini-14 I've looked at is marked ".223" on the receiver. It is a 580-6XXXX with the heavier barrel (up to just ahead of the forearm). Is this rifle chambered for just the civilian .223 Remington round, or will it safely fire 5.56mm NATO?
 
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