We have SOME original parts for that model, we make others. sales@countrygunsmith.net
Try any gunsmith. Try Savage Arms. They have an website. e-gunparts.com (Numrich)
yes, I own two model 60s and one model 75. Most of their parts are interchangeable. The tube magazine and the barrel are shorter on the model 75.
your western field model 550cd was made by mossberg,there model number is 500B.I would try numrich gun parts corp.for your barrel,and use the mossberg 500B number for parts identification.
Try Gun Parts Corp. They have parts for nearly every gun ever made.
The savage models,221,222,223,227,228,and 229 were similar to the model 219,except these models were supplied with a shotgun barrel.(each model listed above represents a different gauge and barrel length).I would try numrich gun parts corp.or E-gun parts.com.
We've got quite a few parts for that model. sales@countrygunsmith.net
Your Hawthorne Warrior M820B is in fact a Mossberg model 340, of which there were various designs. A lot of the parts are available through e-gunparts.com. But, be careful, and ask a lot of question when ordering parts. A lot of the parts are not a direct fit. I have a Mossberg 340KA, and had to replace the barrel. I ended up with a barrel from a Hawthorne M820B. The sights on the Mossberg barrel were dovetail mounted, and the sights on the M820B barrel are mounted with screws. That's just an example. This will get you started in the right direction.
Try e-gunparts.com
numrich
I always start any of my searches for gun parts at Numrich Gun Parts Corp.
A barrel does not have parts per se. You can have sights (front and rear) on a barrel, but the barrel is usually one piece, sometimes two.