no
No
Any barrel will fit only if you replace the tube also to a conventional 1300 tube.
Yes; however, the Remington Coppersolid slug is designed for shotguns with fully rifled barrels. A rifled barrel is not standard on the 1300 Defender but is available as a replacement. The Coppersolid slug can be fired from a 1300 with a standard smooth bore barrel, but long range accuracy will suffer.
No
You must measure it. Different stocks were available.
yes
No
Just the barrel?
Value of a 1980 Winchester rifle 22 short octagonal barrel?
In this model of Winchester rifle,there is no difference in value between the round or octagon barrel.
No