1 is a single-shot rifle with a Farquharson-style hammerless falling-block action, introduced and manufactured by Sturm, Ruger & Co. since 1967.

[4] An underlever lowers the breechblock to allow ammunition loading and also cocks the rifle.

"[5] A shotgun-style tang safety works on the hammer and sear.

Available with an Alexander Henry, Beavertail, or Mannlicher style forearm.

The rifles came in several sub models: 1A, 1AB, 1B, 1H, 1S, 1V and RSI(K designation refers to Stainless with laminated stocks).