All US ones are restricted with barrel lengths of 16.5" or 18". Canada also has 2 models. The 15" barreled CTAR-21 (restricted) and the standard 18.6" barrelled non restricted one. These 2 models are imported by North Sylva Company from Israel. The US versions are largly the same with some modifications such as quick detach sling mounts, and a slimer trigger pack.
All Tavor barrels are manufactured by IWI Israel and are 5.56, but the civi ones are stamped .223 for export regulations.
There is a lot of great info in the Tavor FAQ thread, use the search function and set how far back you want to go, OR go to the black rifle forum and it should be near the top as a sticky.