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Is there a difference between the early models and the later?? I remember something about the chamber diameter?? What would be the difference between one made in 1987 and one made in 1989??
 

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I'm not sure when the switch took place but, the ear;ly Mini-30 had a .308" bore and the new one I believe are .310".
 

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the 189 series began the .310 bore.
the .308 bore had the 'long forcing throat' ahead of the chamber which was the problem with accuracy shooting the steel jacket copper washed ammo.
 
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