We literally have a box of random springs that are not marked. Rather than testing everyone of them, we figure this would be way more fun! For $2 you can get a spring! Want to try your luck and get a downgrade spring for cheap? How about an M120? We have no idea, you have no idea but wouldn't be it awesome if you got your needed spring for only $2?
What you get
Just to be clear, you're getting 1 random unmarked AEG spring.