I have never had to replace any parts, I have only had 2 and have not shot them as much compared to my ARs AKs etc. I have extractors/ejectors, springs but was wondering what others might have had break on them. I have some TRW parts kits I bought years ago but I plan on keeping them intact as they are retirement projects. There are some good lists on various pages but I wonder what parts have actually failed on people.

Tubbs springs a good upgrade? Wolff? I was thinking Tubbs op rod spring n hammer springs, GI for the rest.

This list looks really good.

M14 Spare parts.

I have a set of GI springs and assorted bolt guts.  I've cracked a GI fiberglass handguard.  Shot out one barrel and most of a second.  But haven't gotten to replace anything else.

The Fulton Armory FAQ page has a list of recommended spares, I think.

The Fulton Armory FAQ page has a list of recommended spares, I think.
I switched to Tubb’s springs, but don’t have enough rounds on them to recommend.

I keep a recoil spring and a few other parts . I have a suppressed M1a that will go through recoil springs