I live in the PRK and, therefore, am restricted in what semi-auto rifle in .223 I can buy (have a bolt-action .223). Two questions: I came into possession of quite a bit of the South African '80's production 5.56 ammo; will the Ruger reliably fire this ammo (thinking here of light primer strikes, perhaps); second, should I get the blued or stainless Mini-14 (arguments either way)? Thanks!