Revolution™ 1911 pistols available in four distinct models Sauer & Sohn is distributing four models based on the legendary 1911 pistol used by the US army. The Revolution Granite Series Rail (GSR) 1911 is now being sold in two basic models, a match and a Custom Shop version to ambitious marksmen throughout Europe who seek quality, reliability and performance. All four models – Nitron Rail, Stainless Steel, Target and STX – feature an extended external thumb safety, a firing pin safety, a hammer intercept notch, and a beavertail grip safety with an ergonomic speed bump.