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Posted: 8/3/2009 5:44:14 PM EDT
| Do ARs with carbine lenght gas systems wear out Gas rings faster than ARs with rifle length gas systems? |
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Well my carbine BCG failed the Stand up test only after 400 rounds and my rifle passes the test even after 500 rounds
Both ARs cycle fine but i think im going to buy a BCM BCG an replace the one in my carbine just to be safe. my carbine does pass the bolt drop out test though. |
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Quoted:
Well my carbine BCG failed the Stand up test only after 400 rounds and my rifle passes the test even after 500 rounds Both ARs cycle fine but i think im going to buy a BCM BCG an replace the one in my carbine just to be safe. my carbine does pass the bolt drop out test though. rings should last WAY longer than 400 rds. Did it pass the test when it was new? What manufacturer? |
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Quoted:
Quoted:
Well my carbine BCG failed the Stand up test only after 400 rounds and my rifle passes the test even after 500 rounds Both ARs cycle fine but i think im going to buy a BCM BCG an replace the one in my carbine just to be safe. my carbine does pass the bolt drop out test though. rings should last WAY longer than 400 rds. Did it pass the test when it was new? What manufacturer? I agree, I have a Colt with 3k rounds and it still past the test. But tell me about your test to make sure your not doing it wrong. Is it this test, To test for worn bolt gas rings, remove the firing pin retainer pin, firing pin, and bolt cam pin. Hold the bolt carrier in one hand, and while placing your other hand underneath, invert the bolt carrier so that the bolt is facing down.If the bolt moves on its own, you need to replace the bolt gas rings. |
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Quoted:
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Quoted:
Well my carbine BCG failed the Stand up test only after 400 rounds and my rifle passes the test even after 500 rounds Both ARs cycle fine but i think im going to buy a BCM BCG an replace the one in my carbine just to be safe. my carbine does pass the bolt drop out test though. rings should last WAY longer than 400 rds. Did it pass the test when it was new? What manufacturer? I agree, I have a Colt with 3k rounds and it still past the test. But tell me about your test to make sure your not doing it wrong. Is it this test, To test for worn bolt gas rings, remove the firing pin retainer pin, firing pin, and bolt cam pin. Hold the bolt carrier in one hand, and while placing your other hand underneath, invert the bolt carrier so that the bolt is facing down.If the bolt moves on its own, you need to replace the bolt gas rings. That's the drop out test he mentioned. The stand up test he says first, is just standing the bolt carrier group (bolt in the carrier) on a table. Bolt on the table, carrier up. The carrier shouldn't fall on it's own weight. Yes the rings are supposed to hold up the carrier. But then, I don't necessarily agree this is a valid test. I think that the proper test is like you described where the rings should just be able to hold the weight of the bolt from moving, not the much heavier carrier. |
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I use McFarland one piece gas ring in several rifles.
These just don't wear out but the kicker is you have to try it in your rifle first. Some weapons just don't function well with the one piece ring and in these cases you have to stick to the three piece set-up, at least until the bolt/carrier interface wears in a bit. |
| In Colt armorers school the guy from colt said he has had a rifle for over a decade on the same gas rings and as long as they aren't causing malfunctions, gas rings do not need to be replaced. He said the stand up test really isn't that accurate if my memory serves me correctly. |
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Quoted:
In Colt armorers school the guy from colt said he has had a rifle for over a decade on the same gas rings and as long as they aren't causing malfunctions, gas rings do not need to be replaced. He said the stand up test really isn't that accurate if my memory serves me correctly. He's right and he probably doesn't shoot that particular rifle that often. In Small Arms Repair the first things we did for malfunctioning rifles, after all the usual checks, was the replace the gas rings and the gas tube. |
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Making sure the gas rings are properly lubed, logically would have an effect on how long they last.
After cleaning the BCG, the carrier cylinder walls and gas rings I apply a very generous amount of lube. If the bolt gets dry during firing, a drop of oil in the vent holes in the carrier (the two the gas rings pass) helps to keep the rings lubed. |
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