Quote Originally Posted by MistWolf View Post
If an extractor spring needs an O ring, the spring needs to be replaced.
Kinda like belts and suspenders.

I use 'em because they're cheap insurance (on a carbine). Out of sight, out of mind.

Some of the major mission-stopping failures I've had were from the simplest things. An internally-fogged ART-II scope on an M-21 sniper rifle; a broken M9 locking block; an M4 bolt cracked in half; an Eotech that wouldn't hold zero; and an M16 extractor pin broken in half.