AR15 oring and "critical" spare parts kits

[Koda]

What is the oring for I keep seeing in parts kits?
And why cant I find a single schematic diagram showing where it goes?

AR-STONER Crucial Parts Kit AR-15

The AR-STONER™ Crucial AR-15 Parts Kit is the best option on the market for replacement small parts. Keep this kit on hand during your next AR-15...

www.midwayusa.com

Read More

 

[Hueco]

It's the OG part for the extractor. No longer used as a part of many different extractor springs. @Cerberus Group would be the guy I'd ask.

 

[powermad]

Extractor spring and o-ring.

I toss those and use a 5 coil spring, insert and no o-ring.

 

[Koda]

So it goes in the bolts extractor....?

I cant find a diagram exploded view anywhere on the web. Lame.

Sounds like its not needed.


Note: I dont need to repair anything, I just wanted some spare parts especially as I build another lower... tiny parts tend to fly away.

 

[powermad]

It's used with the 4 coil extractor spring.
BCM includes them with their kit but I don't use them, almost need pliers to compress it as it is with the 5 wire spring.

 

[Hueco]

So it goes in the bolts extractor....?

I cant find a diagram exploded view anywhere on the web. Lame.

Sounds like its not needed.


Note: I dont need to repair anything, I just wanted some spare parts especially as I build another lower... tiny parts tend to fly away.

 

[Hueco]

Note what @powermad is posting: the o ring was originally designed with the original 3 coil spring in mind. Many companies are now using 5 coil springs and omitting the o ring.

I like sprinco for my curly bits and you can read more here: https://www.sprinco.com/ar-extractor.html

 

[powermad]

BCM 3 pack extractor spring kit, $11.95

BCM® Extractor Spring Upgrade Kit - 3 Pack

The BCM® Extractor Spring is a heavy coil design made for the increased extractor tension required on many AR15, M4, M16 short barreled rifles (3-pack).

bravocompanyusa.com

 

[Koda]

Seems like an oring there would regularly wear out.

Probably should have some spare, but ive never taken my bolts apart so I dont know what they use.
Seems like if it was ever needed, to replace what you have with the same? Or just use a 5 coil spring?

 

[Hueco]

Seems like an oring there would regularly wear out.

Probably should have some spare, but ive never taken my bolts apart so I dont know what they use.
Seems like if it was ever needed, to replace what you have with the same? Or just use a 5 coil spring?

Either. I've got both in my spare parts kit. Just know how it all works. I wished I shot enough to wear one out.

 

[powermad]

Colt extractor springs are in stock again.
No o-ring included.

AR15A4 EXTRACTOR SPRING ASSEMBLY

AR15A4 EXTRACTOR SPRING ASSEMBLY https://www.brownells.com/gun-parts/rifle-parts/rifle-bolt-parts/ar15a4-extractor-spring-assembly/

www.brownells.com

 

[Koda]

Either. I've got both in my spare parts kit. Just know how it all works. I wished I shot enough to wear one out.

Im not certain I will ever wear one out as well. I just like the idea of having these small spare parts, the price is cheap enough to add to an order for other stuff.

So the orings a non issue. I'll get the spare parts, stow them in the back of my toolbox and probably never need them.

 

[powermad]

The whole o-ring thing was a carry over from the Mk18 extraction issues.
Adding an o-ring provided more extractor tension and was a quick fix.
Going to the copper 5 coil spring and insert provides more tension with no o-ring to degrade over time.

 

[Member 34319]

So being that I've never heard of this 5 ring spring before this post and I thought I was pretty knowledgeable on ARs, are manufacturers now making them without the o ring? All mine run o rings. Is this a bad thing? All of a sudden I feel like I'm in the dark in something.

 

[titsonritz]

The O-ring was a stop gap solution to extraction issues that began with the Mk18 system, It supposed to go over Extractor Spring and Black Extractor Insert to help aid extraction. That issue as since been resolved with the copper colored Colt spring and others like the Sprinco 4 or 5 coil. Bottom line, there are not needed if you are running the correct spring. If you need one then what you really need are better quality parts.

 

[Koda]

The whole o-ring thing was a carry over from the Mk18 extraction issues.
Adding an o-ring provided more extractor tension and was a quick fix.
Going to the copper 5 coil spring and insert provides more tension with no o-ring to degrade over time.

ah ha... so there it is the real reason for an oring.
I dont know but it just seems to me an oring would wear out sooner than later.

 

[titsonritz]

The whole o-ring thing was a carry over from the Mk18 extraction issues.
Adding an o-ring provided more extractor tension and was a quick fix.
Going to the copper 5 coil spring and insert provides more tension with no o-ring to degrade over time.

Beat me to it while I was typing my replay and digging up a pic.

 

[Koda]

Would this be all I would need to add to any "critical" spare parts purchase?

Wolff Extractor Spring AR-15 Extra Power 3PK

This extractor spring allows for the replacement of a broken or worn spring, improving function and reliability.

www.midwayusa.com

 

[powermad]

So being that I've never heard of this 5 ring spring before this post and I thought I was pretty knowledgeable on ARs, are manufacturers now making them without the o ring? All mine run o rings. Is this a bad thing? All of a sudden I feel like I'm in the dark in something.

The majority do use a 4 coil spring with the o-ring.
The Radian I bought does and it cost quite a bit, cheaping out on a spring is kinda lame.

 

[powermad]

Would this be all I would need to add to any "critical" spare parts purchase?

Wolff Extractor Spring AR-15 Extra Power 3PK

This extractor spring allows for the replacement of a broken or worn spring, improving function and reliability.

www.midwayusa.com

That will work but has no inserts with them, I would get the BCM with the inserts or the Colt with inserts.