You should be able to go to Winchester cause my dad has one for waterfowl and it came with the receiver. Yiu may want to emphasize a 3 inch chamber for more likely match and due to higher pressures required for non-lead pellets
Answeryou could look on eBay or a wenchester department storeNo
No
no the 1300 barrel does not have gas ports in it yes the 1300 barrel will fit ,no it does not have the gas ports BUT any competent machine shop or gunsmith can drill out the ports for you.
Any barrel will fit only if you replace the tube also to a conventional 1300 tube.
no
You can.
Try a 1300 barrel
Yes as long as you get one made for the Winchester model 1300 and chambered for the same length of shotgun shell that the receiver is chambered for.
250
50-300 usd
100-400 USD
No