There's a whole string of Sears 300's with different Sears ID numbers, but they are all the same Winchester Model 1400.
Yes, you can remove the barrel of a model 66 Shotgun!
You would have to list the model number of your shotgun,to identify the maker of your sears and roebuck shotgun,in order to get the correct buttstock.
They probably denote what choke the barrel has.
The cartridges will pop out.
Rifle, handgun and shotgun can all have "long" barrels
I would look at the number of barrels. If there is more than one barrel, you know you have at least a double barrel shotgun. If there are 1 or less barrels, then you don't.
That would depend on the make and model of the shotgun in question,and the length of the barrel/barrels that came with the shotgun.
Sold by Sears Roebuck. Probably manufactured by Stevens.
With the serial number that you provided,your Ithaca double barrel shotgun with the damascus barrels was produced in the year 1900.
Check the barrel and receiver.
100-300 USD
Try the gunbroker.com, or do a google search on the specific barrel you need. Mid West Guns also carries Browning Barrels.