[ARCHIVED THREAD] - Extractor O-Ring? (Page 1 of 2)
Posted: 9/30/2012 4:28:25 PM EDT
Anyone have a wholesale source for the little extractor O-ring? |
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http://www.bravocompanyusa.com/BCM-Extractor-Spring-Uprade-Kit-p/bcm%20extractor%20spring%20upgrade.htm
You just need a few right? |
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Quoted: http://www.bravocompanyusa.com/BCM-Extractor-Spring-Uprade-Kit-p/bcm%20extractor%20spring%20upgrade.htm You just need a few right? 500 or a 1000 |
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 i have never seen an O-Ring on mineIt really helps with heavy duty performance, we build a lot of 7.5" AR's and AR pistols and with out it they don't like to run as good. I can agree ....I run them on anything with a carbine length tube. Seems to help a lot. Also I use heavy buffers and prefer the 9mm buffers. camaro |
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http://www.bravocompanyusa.com/BCM-Extractor-Spring-Uprade-Kit-p/bcm%20extractor%20spring%20upgrade.htm You just need a few right? danco #60 o ring. you get a 10 pack at lowes for $1.50 AND WHAT THE FLYING FUCK. BCM IS SELLING THEM? I GOT LAUGHED AT BY FUCKING RETARDS HERE A COUPLE YEARS BACK WHEN I POSTED "DANCO #60 O-RING AND SPRAY TELFON LUBE IS YOUR FREIND ON AN AR" 1 got told "quiet the adults are talking" well dick bags BC FUCKING M sells them. KMAMFER! |
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Necessary due to the increased pressure due to a carbine length gas system on a 16" barrel.
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i have never seen an O-Ring on mineSome ARs don't have them. Can't remember the purpose for them right now. quadruples the extractor's force. you'll never have an extractor slip off the rim. |
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i have never seen an O-Ring on mineSome ARs don't have them. Can't remember the purpose for them right now. quadruples the extractor's force. you'll never have an extractor slip off the rim. This. I bought an AR from a buddy that was literally NEVER cleaned once so the spent case would get jammed and FTE. Added an "o-ring" from Home Depot, and instead of the extractor slipping off of the case, it started ripping extractor width chunks off of the lip of the case. 
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%100 seriousness, the old Team Associated RC-10 shock o-rings were made of the same material and are the same size. I happened to have a handful of spares, and I'm using those. You should be able to buy a bunch from any online hobby shop..
Here toy go Further edited, not sure which is for which though...so order one of each and see which one fits, they're cheap enough 
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Quoted: here is the McMaster Carr part # 1201T16 Quoted: Measure them, then figure out what's the best material they should be made out of. Then go to McMaster Carr and buy 5k of them for ~$100 I did that route about 8 years ago. I bought a huge pack of the Viton MIL-SPEC O-rings and they don't hold up as long as the Crane O-Rings or the D-Fender rings. In fact, I've put over 6k rounds with the D-Fender rings and they still look new. The Viton O-Rings started to crack. |
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Quoted: Quoted: http://www.bravocompanyusa.com/BCM-Extractor-Spring-Uprade-Kit-p/bcm%20extractor%20spring%20upgrade.htm You just need a few right? danco #60 o ring. you get a 10 pack at lowes for $1.50 AND WHAT THE FLYING FUCK. BCM IS SELLING THEM? I GOT LAUGHED AT BY FUCKING RETARDS HERE A COUPLE YEARS BACK WHEN I POSTED "DANCO #60 O-RING AND SPRAY TELFON LUBE IS YOUR FREIND ON AN AR" 1 got told "quiet the adults are talking" well dick bags BC FUCKING M sells them. KMAMFER! Decafe is your friend |
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Quoted: Thats because the dirt in the chamber was holding (micro second) the shell.Quoted: Quoted: Quoted: i have never seen an O-Ring on mineSome ARs don't have them. Can't remember the purpose for them right now. quadruples the extractor's force. you'll never have an extractor slip off the rim. This. I bought an AR from a buddy that was literally NEVER cleaned once so the spent case would get jammed and FTE. Added an "o-ring" from Home Depot, and instead of the extractor slipping off of the case, it started ripping extractor width chunks off of the lip of the case. Thats all it takes is a micro second delay and you get a FTE |
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since the mall ninjas are here here is a thread with some insight with people that know http://www.m4carbine.net/archive/index.php/t-435.html 
The topic of small arms comes up here in GD, and the shit that gets posted is epic. I don't know whether to laugh or cry. |
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Quoted: I did that route about 8 years ago. I bought a huge pack of the Viton MIL-SPEC O-rings and they don't hold up as long as the Crane O-Rings or the D-Fender rings. In fact, I've put over 6k rounds with the D-Fender rings and they still look new. The Viton O-Rings started to crack. then you either didn't get viton or a bad batch, its not that the crane rings are magic or anything or made from soemthing completely different. How many rounds? I had 2 defenders go to shit on a MG on 2 separate outings but the orings work just fine |
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I gave a friend of mine a Defender D ring to install on his weapon before he deployed to Afghanistan as a Corpsman (note to Obama: It's not "corpse man", you ignorant fuck) with MSOB in 2007. Yes, he fired his weapon at the enemy (VBIED) and was written up for the bronze star, although I'm not sure what happened with that. The D ring was still intact when he completed his tour.
Extractor O-rings were standard on brand new Colt M4s in our armory, and after countless training cycles, I never saw one break. FWIW. |
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So when the BCM bolt carriers come with one not installed, it is a spare or do they leave it up to you to install it? I never bothered to take mine apart, and in thousands of rounds don't think I've ever had a FTE. Option. Your bcg did not come with one installed. |
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The correct oring is a Viton #60 and can be found here for $5 for quantity 50: http://www.mcmaster.com/#catalog/118/3489/=jj7mlw
Others have suggested orings from the local hardware store. While this will work, they are most likely made of soft Buna and are intended for faucets or other no/low heat applications. If you shoot often or have FA the Buna rings will not hold up to repeated high heat, come apart and jam. The oring needs to be Viton fluropolymer. |
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Quoted: The buna I typed at MSC are good from -25° to +250° FThe correct oring is a Viton #60 and can be found here for $5 for quantity 50: http://www.mcmaster.com/#catalog/118/3489/=jj7mlw Others have suggested orings from the local hardware store. While this will work, they are most likely made of soft Buna and are intended for faucets or other no/low heat applications. If you shoot often or have FA the Buna rings will not hold up to repeated high heat, come apart and jam. The oring needs to be Viton fluropolymer. |
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The buna I typed at MSC are good from -25° to +250° F
The correct oring is a Viton #60 and can be found here for $5 for quantity 50: http://www.mcmaster.com/#catalog/118/3489/=jj7mlw Others have suggested orings from the local hardware store. While this will work, they are most likely made of soft Buna and are intended for faucets or other no/low heat applications. If you shoot often or have FA the Buna rings will not hold up to repeated high heat, come apart and jam. The oring needs to be Viton fluropolymer. An AR-15 bolt can get MUCH hotter than 250 degrees. You want Viton. |
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Quoted: Quoted: Quoted: The buna I typed at MSC are good from -25° to +250° FThe correct oring is a Viton #60 and can be found here for $5 for quantity 50: http://www.mcmaster.com/#catalog/118/3489/=jj7mlw Others have suggested orings from the local hardware store. While this will work, they are most likely made of soft Buna and are intended for faucets or other no/low heat applications. If you shoot often or have FA the Buna rings will not hold up to repeated high heat, come apart and jam. The oring needs to be Viton fluropolymer. An AR-15 bolt can get MUCH hotter than 250 degrees. You want Viton. The bolt inside a carrier will not get that hot, I have proved this in practice, the o-ring has not failed, even under full auto fire with a beta c mag dump x 2 ETA I believe the bolt and carrier cvan get to 250 but the o ring will not fail until a lot higher temp Some are rated 450F |
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The buna I typed at MSC are good from -25° to +250° F
The correct oring is a Viton #60 and can be found here for $5 for quantity 50: http://www.mcmaster.com/#catalog/118/3489/=jj7mlw Others have suggested orings from the local hardware store. While this will work, they are most likely made of soft Buna and are intended for faucets or other no/low heat applications. If you shoot often or have FA the Buna rings will not hold up to repeated high heat, come apart and jam. The oring needs to be Viton fluropolymer. An AR-15 bolt can get MUCH hotter than 250 degrees. You want Viton. The bolt inside a carrier will not get that hot, I have proved this in practice, the o-ring has not failed, even under full auto fire with a beta c mag dump x 2 ETA I believe the bolt and carrier cvan get to 250 but the o ring will not fail until a lot higher temp Some are rated 450F *Sigh* Bolts get quite hot during prolonged intense firing. Hot enough that a Viton o-ring is worth the small investment. And just because you haven't had a 250 degree rated o-ring fail, doesn't make it a good idea. Leaving a chambered round in a gun that's red hot may never have been a problem for you either, but it's still a bad idea. |
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Quoted: *sigh*Quoted: Quoted: Quoted: Quoted: The buna I typed at MSC are good from -25° to +250° FThe correct oring is a Viton #60 and can be found here for $5 for quantity 50: http://www.mcmaster.com/#catalog/118/3489/=jj7mlw Others have suggested orings from the local hardware store. While this will work, they are most likely made of soft Buna and are intended for faucets or other no/low heat applications. If you shoot often or have FA the Buna rings will not hold up to repeated high heat, come apart and jam. The oring needs to be Viton fluropolymer. An AR-15 bolt can get MUCH hotter than 250 degrees. You want Viton. The bolt inside a carrier will not get that hot, I have proved this in practice, the o-ring has not failed, even under full auto fire with a beta c mag dump x 2 ETA I believe the bolt and carrier cvan get to 250 but the o ring will not fail until a lot higher temp Some are rated 450F *Sigh* Bolts get quite hot during prolonged intense firing. Hot enough that a Viton o-ring is worth the small investment. And just because you haven't had a 250 degree rated o-ring fail, doesn't make it a good idea. Leaving a chambered round in a gun that's red hot may never have been a problem for you either, but it's still a bad idea. Apples & oranges A hot round cooking off compared to a FTE? Yeah they are the same thing What exactly do you think the temp is inside the extractor plate say after 200 rds of sustained fire? |
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http://www.bravocompanyusa.com/BCM-Extractor-Spring-Uprade-Kit-p/bcm%20extractor%20spring%20upgrade.htm You just need a few right? 500 or a 1000 Grainger.com |
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Considering an AR-15 bolt can get a bit warm, I'm not sure I'd want just any O-Ring pulling extractor duty. I assume like the O-ring around the HK USP barrel, it's a bit more high temperature tolerant, but I could be wrong or it could be that it doesn't get hot enough to matter I suppose. |