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Does not exist. You might find a magazine at egunparts.
Your harrington and richardson model 900 was made between the years 1962-1973.
Gun shops, guns shows, pawn shops, want ads, e-gunparts.com
Try Gun Parts Corp
Blue Book of Gun Values
You will have to measure the inside diameter of the barrel to find out if it is not marked.
Try e-gunparts.com
Have you tried a web search? Local Library? Do a web search on Harrington and Richardson Books and you will find some sources.
Try the following link. I saw it there. www.gungarage.com/gunmanuals.htm
gun parts corp has them on their website.
The Harrington & Richardson 349 Gamester shotgun does not use a clip. It has a tube type magazine that is a pemanent part of the gun, loaded by sliding shells in from the bittom of the gun.
this shotgun was made by Harrington & Richardson and is there model 120.www.e-gunparts.com sells some parts for this gun. searching under Harrington & Richardson model 120 will yield more results for you. good luck.