I would start at numrich gun parts corp,they are on the net,also try E-bay.
Numrich gun parts, look under Marlin/Glenfield parts list
Try Marlin Firearms Co., Numrich Gun Parts Corp., or Gun Parts at the link below.
Try Gunpartscorp.com, ebay, gunauction.com, and Marlin. Good luck
Parets for the OTASCO 6085 are identical as those used in a model 60 Marlin from 1985. They can be purchased from Marlin, Brownells, or Gun Parts Corp.
Which model??
It is the exact same rifle as the Glenfield Model 30A, and yes parts are the same as the Marlin 336. Forearm is the cap style.
there is a marlin collectors site or gunbroker.com
Google Numrich Arms. They have many parts.
The Glenfield 22 model 75 is the same as the Marlin 75. It was made for Sears and the parts probably can be obtained from Marlin In New Haven, Connecticut. This site has parts for the Glenfield model 75. http://www.gunpartscorp.com/ I have them. www.countrygunsmith.net
I have a Marlin Firearms Co. 12 gage, bolt action shotgun.
www.brownells.com
Basically a Marlin Model 80. We have a large supply of parts for that model. sales@countrygunsmith.net