They also have a new modified gas system designed to reduce barrel vibration and can shoot two-inch groups at 100 yards, which is 2 MOA (minute of angle) accuracy.Īround 2007 or 2008, Ruger added a heavier, larger-diameter barrel visibly tapered from gas block to muzzle. They have serial numbers beginning with 580 and are sometimes referred to as 580-series Ranch Rifles. As of 2005, all Mini-14 type rifles are based on the Ranch Rifle design, with integral scope bases, a non-folding ghost ring aperture rear sight, and a winged front sight similar to that used on the Ruger Police Carbine. The standard Mini-14 was discontinued and the name became the family name for all Mini-14 type rifles. In 2003, the design was overhauled to improve accuracy, update the styling, and reduce production costs. I have also read that there were changes made in 2003, that would be present in all rifles from 2005 on. I have read this as well, and according to articles I have read Ruger fixed this in '93. 311 as required for com block spec ammo, which caused some accuracy issues. I could be wrong, but did some of the early ones have.
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