My 721 is made in 1954 and has to he on fire to unload and my oldest 700 made in 71 has to be on fire to unload.for some.reason the model 725 made between the 721/722 and 700 has a Enfield safety. All my other 700 you can unload on safety. So 3 out of my 13 700 can only be unloaded on fire.
http://www.remington.com/pages/news-...odel-40-X.aspx
On this website it's states made before 1982 but my 1988'classic you must put on fire to unload.