I personally wouldn't worry about 15 year old components or ammunition either one, provided that it has been kept dry and free of oil.
If nothing else, load them up for range ammo but I suspect that you won't have any issues.
I've been trying to buy up components lately
I've been working out of a stash of WWII era and Korean war era M2 ball lately, and have about 1 out 20 failures to fire. With the recent ammo shortage, I've burnt up a lot of ammo from the '80s and '90s, and haven't had a single FTF in those.