Do you use a D-Ring in your AR15?

riggins_83 · July 12, 2012, 09:44 PM

Do you use a D-Ring in your AR15 extractor?

Sinlessorrow · July 12, 2012, 10:54 PM

they are not needed in 90% of rifles.

if you run a MK18 and are having issues with the proper extractor spring then use a donut.

if you have any 14.5"+ rifle you should be fine with just the proper spring.

by proper spring I mean the Copper colored colt extractor spring.

cannonfire · July 12, 2012, 10:59 PM

The D ring that holds the hand guards on? Yes I do

Sinlessorrow · July 12, 2012, 11:18 PM

canon the D-ring is the crane spec'd O-Ring that goes around the extractor spring, the part that holds your hand guards is called a Slip ring(or delta ring to some people)

Quentin2 · July 13, 2012, 12:48 AM

Nope, don't use it in my BCM, ArmaLite or Daniel Defense - all 16" midlengths. Some shorter barrels with carbine length gas benefit from them, to positively extract brass before it has cooled and contracted.

cannonfire · July 13, 2012, 09:52 AM

Sinlesssorrow thanks. I always called it a delta ring so thought that's what he meant, always nice to learn something

madcratebuilder · July 13, 2012, 10:31 AM

Quote:

Originally Posted by cannonfire

Sinlesssorrow thanks. I always called it a delta ring so thought that's what he meant, always nice to learn something

Slip ring is the term used in the 23&P manual, Delta ring is from the Colt parts breakdown for the AR-15. Either one would be correct.

D ring is the D shaped rubber ring used to add tension to the extractor. It's the same thing as a regular O ring at a higher price. I got one with a group of parts I ordered online, didn't order it and it wasn't on the invoice. Still in the parts box. You can get the mil-spec O rings from Mc-Car for a $1 each. Only thing I have ever had to use a O ring with is a pistol build.

Quentin2 · July 13, 2012, 01:28 PM

The "D-ring" madcrate described is also called a Defender or something like that and it is D shaped instead of a plain o-ring.

Anyway a proper extractor/spring/insert normally won't need either. Good to have one handy as a bandaid for a marginal extractor.

NickySantoro · July 13, 2012, 02:03 PM

If you need a D ring or an O ring for reliable function, you have an extraction problem that needs to be addressed, not have band aid applied.

Quentin2 · July 13, 2012, 03:19 PM

Quote:

If you need a D ring or an O ring for reliable function, you have an extraction problem that needs to be addressed, not have band aid applied.

True, which is why I used the term bandaid. Kinda like bailing wire, a temporary thing until you can fix it properly. Or see if it helps a range buddy who has a problem. Anyway I keep an extra O ring in the range bag, never used it though.

Sinlessorrow · July 13, 2012, 09:55 PM

not true, in some carbines(read: 10.5") a O-ring is usually required, but everything else should be fine.

Bartholomew Roberts · July 14, 2012, 12:42 AM

In the M4 carbine, you get what is called "extractor lift" where the extractor lifts off the rim of the cartridge for a brief moment during extraction. Normally this is not a problem because the residual chamber pressure is enough to keep the empty casing on the bolt face until the extractor settles back down.

There are a couple of approaches that have been used to mitigate this. One is a redesigned extractor that uses a wider foot and two separate springs (like the Knights SR15E3). Another is to wedge an O-ring or Defender ring under the extractor so it has less room to lift. The main example I can think of is if you get a dinged case or a case with a little extra drag on it, it can fall off if the residual pressure is not strong enough and you'll get a failure to extract.

Quentin2 · July 14, 2012, 01:11 AM

Quote:

not true, in some carbines(read: 10.5") a O-ring is usually required, but everything else should be fine.

The use of an O-ring in shorter barrels was already mentioned above.

Sinlessorrow · July 14, 2012, 01:23 AM

I also think spring design plays a huge role in this.

the original Colt extractor spring was the best and the only AR-15 extractor spring that is not overstressed to the point of giving out early. with under a 40%MTS

the new Colt copper extractor spring is the second best with a slightly higher (i think) 45%MTS.(probably the best for the M4 and M4A1 as well as the MK18

90% of all commercial offerings are incredibly stressed from 50%-90%MTS.

View Poll Results: Do you use a D-Ring on your AR15 extractor?
Yes in all my AR rifles	2	8.33%
Yes in some of them	3	12.50%
No, none of them	12	50.00%
What's a D-Ring?	7	29.17%
Voters: 24. You may not vote on this poll

July 12, 2012, 09:44 PM	#1
riggins_83 Senior Member Join Date: January 19, 2009 Location: Wherever I may roam Posts: 1,456	Do you use a D-Ring in your AR15? Do you use a D-Ring in your AR15 extractor? __________________ l've heard police work is dangerous. Yes, that's why l carry a big gun. Couldn't it go off accidentally? l used to have that problem. What did you do about it? l just think about baseball. -Leslie Nielsen Last edited by riggins_83; July 12, 2012 at 11:17 PM.

July 12, 2012, 10:59 PM	#3
cannonfire Senior Member Join Date: February 12, 2010 Location: Georgia Posts: 474	The D ring that holds the hand guards on? Yes I do __________________ Segui il tuo corso e lascia dir le genti - Dante Blaming guns for crime is like blaming the planes for 9/11

July 13, 2012, 09:52 AM	#6
cannonfire Senior Member Join Date: February 12, 2010 Location: Georgia Posts: 474	Sinlesssorrow thanks. I always called it a delta ring so thought that's what he meant, always nice to learn something __________________ Segui il tuo corso e lascia dir le genti - Dante Blaming guns for crime is like blaming the planes for 9/11

July 12, 2012, 10:54 PM	#2
Sinlessorrow Senior Member Join Date: September 25, 2011 Posts: 145	they are not needed in 90% of rifles. if you run a MK18 and are having issues with the proper extractor spring then use a donut. if you have any 14.5"+ rifle you should be fine with just the proper spring. by proper spring I mean the Copper colored colt extractor spring.

July 12, 2012, 11:18 PM	#4
Sinlessorrow Senior Member Join Date: September 25, 2011 Posts: 145	canon the D-ring is the crane spec'd O-Ring that goes around the extractor spring, the part that holds your hand guards is called a Slip ring(or delta ring to some people)

July 13, 2012, 12:48 AM	#5
Quentin2 Senior Member Join Date: June 18, 2009 Location: NorthWest USA Posts: 1,290	Nope, don't use it in my BCM, ArmaLite or Daniel Defense - all 16" midlengths. Some shorter barrels with carbine length gas benefit from them, to positively extract brass before it has cooled and contracted.

July 13, 2012, 01:28 PM	#8
Quentin2 Senior Member Join Date: June 18, 2009 Location: NorthWest USA Posts: 1,290	The "D-ring" madcrate described is also called a Defender or something like that and it is D shaped instead of a plain o-ring. Anyway a proper extractor/spring/insert normally won't need either. Good to have one handy as a bandaid for a marginal extractor.

July 13, 2012, 02:03 PM	#9
NickySantoro Senior Member Join Date: July 14, 2008 Posts: 195	If you need a D ring or an O ring for reliable function, you have an extraction problem that needs to be addressed, not have band aid applied.

July 13, 2012, 09:55 PM	#11
Sinlessorrow Senior Member Join Date: September 25, 2011 Posts: 145	not true, in some carbines(read: 10.5") a O-ring is usually required, but everything else should be fine.

July 14, 2012, 12:42 AM	#12
Bartholomew Roberts Senior Member Join Date: June 13, 2000 Location: Texas and Oklahoma area Posts: 5,403	In the M4 carbine, you get what is called "extractor lift" where the extractor lifts off the rim of the cartridge for a brief moment during extraction. Normally this is not a problem because the residual chamber pressure is enough to keep the empty casing on the bolt face until the extractor settles back down. There are a couple of approaches that have been used to mitigate this. One is a redesigned extractor that uses a wider foot and two separate springs (like the Knights SR15E3). Another is to wedge an O-ring or Defender ring under the extractor so it has less room to lift. The main example I can think of is if you get a dinged case or a case with a little extra drag on it, it can fall off if the residual pressure is not strong enough and you'll get a failure to extract.

July 14, 2012, 01:23 AM	#14
Sinlessorrow Senior Member Join Date: September 25, 2011 Posts: 145	I also think spring design plays a huge role in this. the original Colt extractor spring was the best and the only AR-15 extractor spring that is not overstressed to the point of giving out early. with under a 40%MTS the new Colt copper extractor spring is the second best with a slightly higher (i think) 45%MTS.(probably the best for the M4 and M4A1 as well as the MK18 90% of all commercial offerings are incredibly stressed from 50%-90%MTS.