I don't think the Mini was ever 're-tooled' to handle 5.56, ever since the first Mini's on the market, the 180 series and the AC556's the Mini has been chambered for 5.56 and .223. Ruger uses a propitiatory chamber that handles both rounds.
1 - 6 of 6 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.