 The "PD" Farquharson rifles by Jeffery and other makers are less rare, but are still generally considered collector pieces rather than working weapons.Ruger introduced their No.1 single-shot rifle in 1967, a falling-block design loosely styled after the Farquharson rifles, and it remains one of their best selling firearms.Several other gunmakers offering bespoke single-shot rifles more or less based on the Farquharson, including Soroka Rifle Co. in New Zealand, Dakota Arms Inc. in Sturgis, South Dakota and Sturtevant Arms Company in Pueblo, Colorado.