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I purchased a mod 25 today and I was able to buy two extra seven shot clips from the gun trader in taylors S.C. You might want to try Midway USA,they have a very large selection of firearms parts
http://e-gunparts.com/ has themNo they do not.
Start with GunPartsCorp of West Hurley, NY and then try going to Marlin.
The Glenfield model 75C is a carbine variant of the Marlin model 60 produced for 1975 to 1992 by th m Mrlin Firearms Company under the name of Glenfield. Differences include shorter 18 inch barrel compared to the Marlin's 20. Length of pull on the Glenfield is shorter. The Glenfield also has a shorter and lower capacity magazine tube. The Glenfield hold 9 shots in the magazine, while current Marlins hold 15. Nearly all parts are interchangeable, and the Glenfield can be converted to modern full sized Marlin 60 specifications if desired.
Try here. Look under Marlin and see if you find a similar one.
Good luck. Every site on the Internet seems to be out of the 10 1/2 inch magazine tube for the Glenfield/Marlin 75. Keep in mind, the Marlin 99M1 uses the same tube, but that is just as hard to find. I have been reading up on converting it over to a Marlin 60CC Magazine Tube inner and outter, but not even sure that will work.
THIS Glenfield MOD 50 BOLT ACTION SHOTGUN WAS MANUFACTURED 1966-1972. I HAVE ONE AND ALSO CANNOT LOCATE THE SERIAL NUMBER.
I have a Glenfield Model 50 that i purchased new in 1969 or 1970,there about.
Exc. V.G. Good Fair $120 $100 $75 $50 Try gunpartscorp.com for a magazine or triple K in San Diego or the Old West Scrounger
Try Numrich gun parts. e-gunparts .com
ammoclip.com $18 plus shipping The Glenfield model 25 was made by Marlin as the model 80
The glenfield version of the marlin mod 336 are selling for between 200-300 dollars,depending on the overall condition of the rifle.