Factory magazine for Marlin 80 DL $18 + $7 shipping at ammoclip.com
Glenfield was made by Marlin. Check with a local gun shop.
ableammo.com has them for $13
Where Can I Buy A Clip For A1966Enfield Rifle Where Can I Buy A Clip For A1966Enfield Rifle
They don't have clips. They have magazines. You can order them through Numrich.
midway usa.com
I'd try Numrich at e-gunparts.com first.
numrich arms gun parts corp
I have Been told that this gun is a copy of a marlin 80 and that clip Should fit it but this is just heresay
Try Numrich Gun Parts Corp.They may be found on the web.
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Numrich Gun Parts. and Posibly Midway USA
K Mart did not make guns- they bought them from companies like Mossberg, Marlin, Remington, who marked them K Mart's brand and a model number. If you post the model number and all other markings here, we may be able to give you the parent make and model, and a source for a magazine, And a .22 Long is not a shotgun, it is a rifle. You can also take your rifle to a gunsmith, who can cross reference the store model number to the parent model.