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					Originally Posted by DrHenley  I don't understand what you mean by a "factory case from my last AR." 
Was it a new factory loaded round?  How did it come from your last AR?     | 
	
 I had an AR before this one . I also had some once shot cases from factory loads on hand so I tried one in these  and it hard locked the bolt just as my recent Reload cases and cartridges.  
Make sense now ? Now I am confused as usual .