Massad; has a good thought Massad Ayoob on the Ruger SR 556 http://backwoodshome.com/blogs/MassadAyoob/ New Ruger in Hand June 11th, 2009 by Mas As noted here earlier, the rifle is designated SR556, for
Sturm, Ruger 5.56 millimeter. It takes standard AR15/M16 magazines, and comes with three of them, produced by Magpul, one of the best makers. Its the most vendor-outsourced ...