The serial number is found on the under side of the gun before the forearm.
want ad, gun show, gun shop
Forearm- or sometimes, forestock.
From your description,I would say that you have a Model 72 Crackshot rifle that was made from 1972-1989.
Try MidWest Gun Works
remove pin from end of magazine tube at barrel muzzle, pull magazine tube from forearm, forearm is now ready to be lifted off barrel
Deff a sniper rifle
try e-gunparts.com or bobs gun parts, "gun-parts.com"
The one my dad has uses the same forearm. It should just snap on just like it does on the rifle barrel.
Basically they are the same. But a long Barrel and a long shoulder stock make a gun a Rifle.
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The Winchester Rifle.