Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Ruger SP-101 is a series of double action revolvers produced by the American company Sturm, Ruger. The SP101s are 5-shot (and 6-shot variations for smaller calibers), small frame and all-steel construction carry revolvers. The Ruger SP-101 was introduced in 1993 as the smaller frame counterpart to the GP-100. Both of these revolvers, together, replaced the long-standing staple in the American firearm''s market, the Ruger Six series revolvers. While no longer manufactured, a 9mm version was also available until around 1998 and a .22LR version was also available until 2003.