New GI-45's are notorious for bad extractors and recoil spring problems.
Remove extractor, put a little more bend in it, file the hook a tiny bit to clean it up and sharpen it and try again.
A Wolff recoil spring could help too.
Lotsa info availbe on the specialized .45 forums on-line.
How many rounds thru your pistol, has it been broken in, polished the feed ramp at all (be carefull) or try other mags?
It's got a lot of MIM parts that are often replaced. The Ed Brown or Wilson Extractors are favorites. It probably has it's stock ILS Safety Lock and Titanium Firing Pin. An Ed Brown 9mm/38 spl Steel Firing Pin for Springfield, along with an extra power Wolff Firing Pin Spring will help along with a Colt Steel Firing Pin Stop. If you're up for a little work, replace the ILS and MSH with all regualr mil-spec Colt parts and an S&A MSH in your choice of finished..ribbed, smooth or checkered. An EGW sear can make a big difference too. Endless possibilities!
You're not alone!