With regards to the threads, KEE's not kidding. The fewer lead threads is the new Cocker system. Expect to see it on many/most of the high end Cocker barrels going forward.
As a demonstration of no loss of strength of the gun-barrel connection, I give you the Super Freak from WCO that Chris Jansen of Boom fell on in a dive gone horribly bad. Notice it didn't break or give at the threads.