You talking in the lower reciever, or the actual bolt carrier itself? The extractor on the bolt does have a small spring on it, but the lower reciever and the trigger springs are quite small. You'll never have to take those springs down, honestly. I haven't seen many armorers dis-assemble the trigger assembly. Now the small extractor spring you might have to watch out for, it's tiny as hell. Blind fold me, and I'll strip an AR15 for you.
-I'm serious
-I did it a few nights ago for fun.