Ggins 12ga 583 1101 was made by gh Standard for Sears 1958 to 1960 It was made in 20 /16 and 12 gauge it was offered with fixed chokes full or modified and was also available with a very good poly choke. These guns were an all new model introduced in 1957 as 583 1100 it replaced the old H&R based model 10. It was one of the best guns of its type very high quality.
There is a fair bit of confusion about the Harrington & Richardson models 120 and 121 and the Sears J. Higgins Model 10 shotguns. Here is data from the Jack First and the Numrich Gun Parts catalogs.
Note that neither Numrich nor Jack First have complete listings of the Sears bolt action shotguns. Note that both Numrich and Jack First list 583.20 as a pump shotgun model which is an error. It is my opinion that most variations of these two catalogs form the basis for the other cross references that I have come across.
The Blue Book dnd Brownells both credit Numrich for their crossover data. The Harrington & Richardson shotgun Models 120 and 121 came in 16 and 20 Gauge where as the Sears Model 10 came in 12 , 16 and 20 gauge. Early examples of the two brands do look alike externally right down to the style of rubber recoil pad.
With the stock off there are some obvious differences. The Numrich parts picture of the models 120 and 121 are different from the High Standard shotgun. Specifically the lugs that are the mounting points for the magazine tube, the sear and the trigger are different from the High Standard shotguns.
The H&R uses three attachment pieces while HS uses only two.
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