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Chief Armorer for Elite Shooting Sports in Manassas VA
Chief Armorer for Corp Arms (FFL 07-08/SOT 02)
What you experienced is 100% normal. Give the spring about 20 rounds to break in and you should be good after that. I would keep the O-ring out for at least 1k if you have experiencing issues.
Where the problem lies is that not all extractors are created equal. Some of the "pockets" where the extractor spring and insert sit are not as deep as others.
C4
I replaced my original Extractor spring with the Buffer Technologies Extractor Upgrade Kit (sourced from Brownells). It consisted of the spring, black insert and an O-ring.
It fitted well, but after circa 1000 rounds the O-ring broke. The carbine was feeding well. I realised it was broken when I stripped it to clean it. The O-ring looked like it was pinched/cut/squeezed on the side(?).
Does one need the O-ring, or can I run it just with the spring and the black insert? My AR was feeding well before I installed the 'Upgrade Kit'.
Owner/Instructor at Semper Paratus Arms
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Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
I think Iraqgunz hits the nail on the head. Good extractor spring really negates the need for the O ring I have found.
I put the 5 coild Sprinco extractor springs in all my ARs, Carbine and Middy. It was a B**** to put in and my thumb hurt for a couple days. The tension is good, real good. For a while it generated very fine, micro brass flakes after pulling cases out with a vengeance. It seems to die down with time.
Run a 5 coil and you won't have a problem.
It's generally accepted that carbines need more extractor tension than the original M16, and it's also generally accepted that the o-ring and extra power extractor together are usaully too much.
We use a rifle extractor and O-ring on our rifles. We believe the O-ring has a longer service life than an extractor spring alone, while giving the increased extractor tension needed.
For a duty or defensive carbine it's also important to change the extractor spring based on a round count, not failure to extract.
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