You can find new replacement barres at green mountain barrel co, track of the wolf and log cabin shop. Used ones can be found on gunbroker, auction arms and ebay. You will need to know what model your stock is for proper fit of the underlug and cross pin.
The Thompson Center hawken that I have,has a barrel that is 28 inches long.
There are no published date codes for them so the only way to find out for sure is to contact Thompson Center directly.
100-400 USD
On 90% of the guns it is stamped on the right side of the barrel as "Thompson/Center Rochester New Hampshire" and "HAWKEN 45 Cal" along with a serial number on the left side. If not the easiest way would be to go to gunbroker.com or Google and search for Thompson center hawken, compare the pictures and description to what you have.
100-400
100-400
To find out the age and value of a 50 cal Thompson Center Thunderhawk one will need to call the maker or take the gun to a dealer. You can even call a dealer and give them the serial number 20752 and they may be able to look it up.
100-400 USD or so
200-400 USD
100-400 or so
You must call TC
You can download the manual for the TC Scout at the Thompson Center website www.tcarms.com that shows the take-down on the Scout and has all the info for care and cleaning as well as recommended and maximum load data. Just be careful when removing the breech plug not to bugger the the end, the scout tool can be helpful but is not a necessity.