Yessir Looky, looking for dat spring onda groun at four am ain't no easy chore.I keep my spare rings on the mag tube.
Never know when yer gonna need'im and I really reeelyy hate lewk'in fur chit.
Western Gun Parts - old school shop, you gotta actually call and talk to them and see what they got. Website is basically contact info only.
http://westerngunparts.com/index.html
They shipped quick and knew exactly what they were talking about, and best of all actually had this stuff in stock. I was absolutely floored they stocked it.
What does the jury say about storing your spare friction rings under the recoil spring. Personally I wouldn't do it. I think it causes too much prelode.
It's a long recoil system, so your two problems would be not enough preload/spring (hammer the receiver to death) or too much spring pressure (won't eject).
If its ejecting light trap loads with the spares in the stack at the back, it's fine.