Springfiled told me to use a standard 5" 1911 spring rated for 19 Lbs. That is what they use as stock springs. Choice of other spring ratings is up to you but be forewarned it could lead to timing problems and other issues.netrooper said:hi guys, new to the forum, and what a great forum it is. need some help. getting a xd-tac but can't decide on a 9 or a 40. help! also read alot about changing the spring to a #22 what does a new xd come with from the factory.