CSI677

King, is that with a lightened slide?

Hey guess I'm a new poster to the forums and I hope this topic hasn't come up previously but I wasn't able to find it in a search. I am customizing a 1911 45 ACP and I am going to be lightening the slide a bit to around 11-12 ounces. I am looking for some insight on what poundages to look for in a recoil spring. I will be reloading but I also want to be able to throw some factory ammo in it and go. Any help will be greatly appreciated.