A R S 223 5.56 Extractor O-ring (Crane O-ring) 5 pack

The weak point of the AR15 system is the minuscule extractor. Check out how this compares to the extractor of the AK, SKS, M1 etc. The two parts that bear a higher than normal stress level are the extractor and cam pin. With extended shooting sessions, dirty or corroded ammo/chamber, STEEL cased ammo, the extractor has a tendency to slip off the rim and this causes a double feed. A short term fix is beefing up the spring and tension system of the extractor. Newer AR's are coming from factory equipped with a beefier extractor spring and many even with this rubber device. This device is a must on any extractor. There is no sense or need to spend ten-buck or more for the D shaped rubber one. This is the way to go. This multi pack is value priced and allows you to replace the donut after an extended session or anytime the old donut looks compromised or even shot. I would recommend getting several packets of these. Swap the old donut out regularly. At this price it cannot be beat. Cogito,ergo armature Sum!

Professor Foam shipped fast via first class mail. Even sent a follow up email to ensure I received it. I ordered this kit specifically for the O-rings. Once I received it, the O-ring went on with no issues. It's tight so use some elbow grease yet ensure you're not breaking the extractor spring. I was having extraction problems where the spend casing would not eject from the chamber and would cause a malfunction. I will update once I get a few rounds through my AR.

Quality O rings for the AR bolt. Crane has the better of the extractor orings offered and has become standard and no longer the upgrade. Using the orings, spring and plastic plug ensures extraction of cheaper steel cased .223/5.56 ammunition. Basically, cheap insurance for reliability of extraction.

The O-rings are almost all used up. I’ve shot with my rifles with the new O-ring and it worked fine. The spring assembly was useless. Doesn’t fit at all. Why include it when it does not fit.

Turns out, I didn't need them but it never hurts to have small parts.

Not used yet but the rubber rings are still in good shape. It's good to have an extra set.

I thought I was buying an extractor spring and some o-rings, I needed the spring asap, so I bought the fastest shipping available. But all I got were some really bad quality hollow roll pins that no one would put into their rifle and no extractor spring. No help in getting it fixed.

They do what they do, good part and good company.Side note---- never buy from RELIABLE VALUES. They will suck the air out of your lungs, they suck so bad.