[2]: 317 These actions were essentially exact copies of those used by Gibbs to build his military target Farquharson rifles, which had a solid combined lower tang and trigger guard.
[2]: 126, 313 The actions had "PD" stamped on the receiver, which stood for "public domain," indicating there was no patent infringement in utilizing the design.
In 1904 Jefferey introduced a larger version of this action called the Model 1904 and chambered in the 600 Nitro Express.
"[2]: 320 Because of its rarity, the original Gibbs-Farquharson rifles are highly prized collector pieces today.
The public domain "PD" Farquharson rifles made by other companies are less rare, but are still generally considered collector pieces rather than working firearms.