Starting about 1918 and until about 1938, Hunter Arms' magazine advertisements listed McDonald & Linforth as the Pacific coast agents. Surprisingly I can find little about the company, other than it was listed as a Manufacturer's Agent (or jobber) and apparently did not have a retail store. There was a Linforth, Kellogg & Co. hardware store in San Francisco in the late 1800s, but apparently not during this period.
Interestingly, Parker ads during this time listed Capt. DuBray as the Pacific or West Coast agent, and Peters Cartridge listed Sloss & Brittain, San Francisco.
A 1923 ad in "Hunter - Trader - Trapper"
Neat 1936 ad
McDonald & Linforth was also the jobber for Benjamin Air Rifles; 1922 "Hardware World". I couldn't find any other firearm or ammo co. they represented.
No doubt Dr. Jim has seen lots of west coast orders through M&L.
It would be interesting to know how the concern got connected with Hunter Arms after the bankruptcy and before the purchase by the Simmons family in 1920.