CORRECTION:
To All:
My mistake I mixed things up.
The price Quoted is for 1 item
I.E. 1 Plunger is $12.00
Jim,
I've seen plenty lost when taking bolts apart or they damage the shape.
Tossed Extractors most often end up in lost Plungers.
Same with bolt lugs breaking.
Sometimes just thru years of use the Plungers tip or flat edge gets miss shaped and tends to rotate.
Chipped Extractors or weak/broken plunger springs don't have enough tension to keep it in place.
Some I've seen with the bottom stem snapped off.
Some are Repro made for commercials and aren't as hard.
Any used in a bolt that seen action in M2 model can have the coned tip flattened and not quite enough length left to set firmly on the Extractor ledge.
Also nice to have when you have multiple stand by back up bolts.
A general problem? I'd say no
But I can say the ones I've serviced at the Rifle club that see a lot of use (like a rental car) aren't handled like a owner would baby it.
Shot hard put up wet.. comes to mind.
Need many ? Guess that depends on how many carbines and bolts you own and service. And how long you plan to keep owning and servicing.
I do know after looking hard for them and seeing most listings for 1 at a time with a spring for $16.99 + shipping (more or less $ depending on the listing). I decided about a year ago to start gathering what I could.
Who knows what may happen to Internet gun/part sales in the near future.
Seems I heard the AR-15 forum was shut down because of a 'Single Complaint'.
Though I know it's up again.
We are now a Clear and Present Danger.