If you are already 310, you should get something that is 310 from every normal boss. I want the option to try different guns but not sacrifice my hard earned light level to do so. 309-310 pretty much impossible if you aren't 25 with a faction and have the best luck with boots. Sorry you didn't grind for a year, you don't have access to this exotic. If hardmode should drop something for you, it should at least be the same light level as the piece currently equipped in that slot.