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Old March 24th, 2019, 01:11 PM #1
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PSA - check your AR gas rings

This particular BCG had only about 3k rounds on it - entirely 5.56. Noticed the bolt was moving a little to freely in the BCG on last cleaning and stood it on end. Sure enough, carrier dropped down immediately. Pulled the rings to replace (and since I planned to replace I wasn’t gentle about it). You can see one of the three looks like it has either worn excessively or partially shorn off.

Note, the rifle was cycling just fine at last use so manual inspection was the only way to discover. Inside of my BCG appears ok and now that the rings are replaced it passes the gravity test. But those functioning gas rings are there for a reason. Thought I would share because I think standard thinking is 10k rounds on the rings...
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Old March 24th, 2019, 01:27 PM #2
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Good post KIB.
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Old March 24th, 2019, 02:07 PM #3
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Never seen a gas ring wear that much with only 3,000 rds.
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Old March 24th, 2019, 02:34 PM #4
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Some guns can erode as fast as 500 rounds, but that is usually indicative of a problem with the quality of the gas rings or the condition of the bore in the carrier.

Gas Ring Erosion is more aggressive in short barrels, short gas systems, and with suppressor use.
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Old March 24th, 2019, 02:47 PM #5
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Quote:
Originally Posted by clandestine View Post
Some guns can erode as fast as 500 rounds, but that is usually indicative of a problem with the quality of the gas rings or the condition of be bore in the carrier.

Gas Ring Erosion is more aggressive in short barrels, short gas systems, and with suppressor use.
That is what I suspected.
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Old March 24th, 2019, 02:52 PM #6
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Quote:
Originally Posted by clandestine View Post
Some guns can erode as fast as 500 rounds, but that is usually indicative of a problem with the quality of the gas rings or the condition of be bore in the carrier.

Gas Ring Erosion is more aggressive in short barrels, short gas systems, and with suppressor use.
Good ESP! 10.5 with a krinkov style muzzle device. BCG was Bravo Company
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Old July 17th, 2019, 09:07 PM #7
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I just experienced my first worn gas ring. The BCG in question is a Palmetto State Armory "Premium BCG". It was riding inside a brand new upper with 16" barrel and a mid-length gas system. After about 700 rounds the gas ring closest to the bolt face has a larger than normal gap in it and the bolt will slide in and out of the carrier with little resistance. However the rifle fired and cycled just fine in my most recent session at the range. Much of the brass was ending up at my "4 o'clock position".

Now I wonder how many more rounds I can fire before the gun fails to cycle, or if I should I replace them right away to prevent excessive wear.

It never crossed my mind that gas rings could be of different quality, but it is plausible that low cost BCGs need to cut costs somewhere, or everywhere. I just purchased some generic looking gas rings from Amazon, and plan to purchase a couple "Colt OEM" parts to see if there is a difference.

For comparison I checked the BCG on a Rock River Arms upper which also has a 16" barrel with a mid-length gas system, but with about 4,000 rounds fired through it. And to my surprise the gas rings in this BCG are still fine, it still supports the weight of the carrier when the assembled BCG is stood up against the bolt face.

Quote:
Originally Posted by clandestine View Post
Some guns can erode as fast as 500 rounds, but that is usually indicative of a problem with the quality of the gas rings or the condition of the bore in the carrier.

Gas Ring Erosion is more aggressive in short barrels, short gas systems, and with suppressor use.
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Old July 18th, 2019, 08:43 AM #8
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Good info... I just bought a PSA upper will keep and eye out on how mine are wearing.
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Old July 19th, 2019, 12:55 PM #9
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Quote:
Originally Posted by chino101 View Post
I just experienced my first worn gas ring. The BCG in question is a Palmetto State Armory "Premium BCG". It was riding inside a brand new upper with 16" barrel and a mid-length gas system. After about 700 rounds the gas ring closest to the bolt face has a larger than normal gap in it and the bolt will slide in and out of the carrier with little resistance. However the rifle fired and cycled just fine in my most recent session at the range. Much of the brass was ending up at my "4 o'clock position".

Now I wonder how many more rounds I can fire before the gun fails to cycle, or if I should I replace them right away to prevent excessive wear.

It never crossed my mind that gas rings could be of different quality, but it is plausible that low cost BCGs need to cut costs somewhere, or everywhere. I just purchased some generic looking gas rings from Amazon, and plan to purchase a couple "Colt OEM" parts to see if there is a difference.

For comparison I checked the BCG on a Rock River Arms upper which also has a 16" barrel with a mid-length gas system, but with about 4,000 rounds fired through it. And to my surprise the gas rings in this BCG are still fine, it still supports the weight of the carrier when the assembled BCG is stood up against the bolt face.
They are super cheap. Replace them now.
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