50-850 usd
yes
The only barrels that will fit the Winchester model 120 are all model 1300 winchester barrels,and most model1200 Winchester barrels.So the answer to your question is No.
Yes. Slug barrels have a different "Choke" then shot barrels that make them more accurate when firing slugs, but you can fire slugs with a stock 1200 barrel.
The Winchester 140 12 gauge has a choke barrel at 28". This is the same choke size as the 20 gauge model.
NoThis is from the Winchester Website:How versatile are the Model 1300 barrels? Will they fit earlier or different models?The Model 1300 barrels will fit Model 1200 receivers, but 1200 barrels will not fit a Model 1300. Model 1400 barrels will not interchange with Models 1200 or 1300 barrels.The Model 1300 Defender barrels will not interchange with the 1300 Field models and viceversa.
Same choke tube as a 1200 or 1400 pump
THREE one
No.
None
50-350 usd
yes
what does 120A choke mean-- I have no idea what you are talking about with this question about a choke