User Panel
User Panel
User Panel
|
Posted: 11/16/2014 5:21:14 PM EDT
[#1]
It is because the test is not done with the rings holding up the weight of the carrier. You hold the carrier pointing down and if the bolt does not fall out under its own weight the rings are ok. I have never had a problem caused by the rings even then.
|
|
|
|
Posted: 11/16/2014 10:04:44 PM EDT
[#2]
Quote HistoryQuoted:
It is because the test is not done with the rings holding up the weight of the carrier. You hold the carrier pointing down and if the bolt does not fall out under its own weight the rings are ok. I have never had a problem caused by the rings even then. Really? I have not heard of that test. https://www.youtube.com/watch?v=jRYXsyS2B98 https://www.youtube.com/watch?v=BpkzWhoaK04 |
|
|
|
Posted: 11/16/2014 11:56:45 PM EDT
[#3]
The other poster is correct; that is how gas rings are tested per TM 9-1005-319-23&P. Which you also remove the cam pin, firing pin retaining pin, and firing pin. Then holding the carrier, point the bolt downwards. If the bolt does not fall out of the carrier, the rings pass the test.
In a paper titled Increasing Small Arms Lethality in Afghanistan: Taking Back the Infantry Half-Kilometer, the author Army Major Thomas Ehrhart suggests a different approach due to how inexpensive gas rings cost. His method uses almost the same steps above, except he suggests holding the bolt, and pointing the carrier downwards. His reasoning is that if the rings are in good enough shape to hold the weight of the carrier; they are dependable enough to take outside the wire. |
|
|
|
Posted: 11/17/2014 1:31:09 AM EDT
[#4]
I'm having a similar issue although mine is semi-auto but does have a full auto BCG, both from BCM and Sabre Defence.
The BCM is brand new and I haven't gotten to shoot with it yet. The Sabre Defence BCG had less than 700 rounds through it on a 16" barrel with mid-length gas and this happened. 
I then ordered a new BCM BCG, new barrel chambered in .223 Wylde with carbine gas (found out I had mid-length after I tried installing the new barrel and my gas tube wouldn't fit), new heavy buffer 4.9 oz and a Spikes Tactical Dynacomp Extreme 2 muzzle break. I used to run my AR on the dry side (oiled but wiped down) and seeing how I had mid-length gas before I'm thinking mine happened because it wasn't wet enough. I'm going to try running the new BCG really wet this time and see how it works out. Ill also keep keep an eye on my brass to see of I'm now over gassed with carbine gas vs mid-length on the same 16" barrel. |
|
|
|
Posted: 11/17/2014 9:12:59 AM EDT
[#5]
Spoiler alert: things you see on you tube may not be accurate.
You need to spend some time with the TM which is available for download on this site. 3-18 shows how to test the rings, http://www.ar15.com/content/webPDF/TM9-1005-319-23.pdf |
|
|
|
Posted: 11/17/2014 10:30:39 AM EDT
[#6]
Quote HistoryQuoted:
Spoiler alert: things you see on you tube may not be accurate. You need to spend some time with the TM which is available for download on this site. 3-18 shows how to test the rings, http://www.ar15.com/content/webPDF/TM9-1005-319-23.pdf I'll check it again tonight and report back. Thanks. ps. I know YouTube is not the end all to information but a lot of time it is very helpful. |
|
|
|
Posted: 11/17/2014 10:39:42 AM EDT
[#7]
the inside of the carrier is like a cylinder in a car's engine, and the bolt is the piston. this is one place on the rifle that likes to run wet to save the "piston" rings and save the carrier from getting damage because of broken rings. once the inside of the carrier gets scored or badly gouged, premature ring failure will be the result.
|
|
|
|
Posted: 11/17/2014 2:58:54 PM EDT
[#8]
Quote HistoryQuoted:
the inside of the carrier is like a cylinder in a car's engine, and the bolt is the piston. this is one place on the rifle that likes to run wet to save the "piston" rings and save the carrier from getting damage because of broken rings. once the inside of the carrier gets scored or badly gouged, premature ring failure will be the result. Hmmmmm.... Maybe I need a new carrier then? |
|
|
|
Posted: 11/17/2014 10:30:30 PM EDT
[#9]
Quote HistoryQuoted:
Spoiler alert: things you see on you tube may not be accurate. You need to spend some time with the TM which is available for download on this site. 3-18 shows how to test the rings, http://www.ar15.com/content/webPDF/TM9-1005-319-23.pdf It did pass this test so I am going to continue to shoot it and keep an eye on it. |
|
|
|
Posted: 11/17/2014 11:56:00 PM EDT
[#10]
If the carrier is eating rings, then either there is a bur in the gas chamber section of the carrier that is catching the ring to bend it, or the larger to smaller taper section of the carrier gas section was milled too deep and as the bolt goes to unlock, the last ring is exscaping from the smaller section to the larger section, and being bent as it being forced back in at bolt lock up.
|
|
|
|
Posted: 11/18/2014 9:49:46 AM EDT
[#11]
Quote HistoryQuoted:
It did pass this test so I am going to continue to shoot it and keep an eye on it. Quote HistoryQuoted:
Quoted:
Spoiler alert: things you see on you tube may not be accurate. You need to spend some time with the TM which is available for download on this site. 3-18 shows how to test the rings, http://www.ar15.com/content/webPDF/TM9-1005-319-23.pdf It did pass this test so I am going to continue to shoot it and keep an eye on it. Well it's BCM and they said I am welcome to send it back to have them inspect it, not sure if that is necessary or not at this point. |
|
|
|
Posted: 11/26/2014 9:48:41 AM EDT
[#12]
Quote HistoryQuoted:
Well it's BCM and they said I am welcome to send it back to have them inspect it, not sure if that is necessary or not at this point. Quote HistoryQuoted:
Quoted:
Quoted:
Spoiler alert: things you see on you tube may not be accurate. You need to spend some time with the TM which is available for download on this site. 3-18 shows how to test the rings, http://www.ar15.com/content/webPDF/TM9-1005-319-23.pdf It did pass this test so I am going to continue to shoot it and keep an eye on it. Well it's BCM and they said I am welcome to send it back to have them inspect it, not sure if that is necessary or not at this point. I send my BCG into them for having some rough spots on the inside of the carrier due to a bad chrome lining that cause it to eat up rings. They took very good care of me |
|
|
|
Posted: 11/28/2014 1:35:27 PM EDT
[#13]
What we teach in armorer courses is that the life of a gas ring is about 3500rds, beyond that you are on borrowed time. This doesn't mean that you have to change them at 3500rds, what it means is that if you have gotten 3500rds or more and the gas rings erode to the point they don't work, then they have done their job. IMHO what wears gas rings out is mostly carbon fouling build up, carbon is abrasive, and if carbon builds up to the point it comes of where metal rubs metal then you will have chunks floating around, and those chunks erode the gas rings. What we do for training is run the tail of the bolt good and wet with a good lubricant like Slip2000 "EWL" Extreme Weapons Lube, it will help keep the heavy carbon from building, and lubricates where metal rubs metal, resulting in longer life on the gas rings. We have found that the Slip2000 "EWL" stays wet, and breaks down the carbon, where many other lubricants will burn up resulting in heavy carbon fouling and more friction.
I have seen numerous bad bolt carriers that were eating up gas rings to the point they would fall off the bolt, average was about 600rds to when the gas rings were missing about 1/3" of its material. Looking inside these carriers showed two things, burrs, lack of chrome or a combination of both. When looking inside the bolt carrier, look at the area on the right side around the 1/8" holes where the gas exhaust is vented when the bolt unlocks, if there are burrs then it may indicate that the inside of the bolt carrier was never honed. We have also come across bolt carriers that had no chrome lining inside of the bolt carrier. In all of these cases, the owners got replacement bolt carriers from the sources that they came from. CY6 Greg Sullivan "Sully" SLR15 Rifles TheDefensiveEdge.com (763) 712-0123 |
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
