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Posted: 3/12/2004 8:16:24 PM EDT
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I was hoping that you guys could answer a little question for me. I just got a new AR and noticed that the Gas tube has a bit of wiggle room inside the receiver. Not a ton, but enough that it can move back and forth. If I remember correctly, the ones I handled back in the Army did not do that. Is it a problem for the gas tube to move a little inside the receiver? Should it be absolutely rigid? How loose is loose? The rifle functions perfectly, but I only have about 300 rounds through it at this point. Any info would be much appreciated. |
| FedDc, IMHO as long as it functions you are ok. I have some "wiggle" in my BM and it is trucking right along. If you look at the opening of the tube AND the BC tube you can see they beveled to allow for the wiggle. I think that if for some reason you were to be placing pressure on it with something non-metallic, and with the heat generated in that tube, you will know shortly by the smell. It just sounds like you've got an AR on the low end of the stackup for the GT hole. HTH, and YMMV. |
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Remove the bolt from the bolt carrier and by hand move the carrier back and forth in the upper receiver. You should not feel any resistance of any sort when the gas tube enters the gas key on the top of the carrier. If you do remove the handguards and press the gas tube in the opposite direction from the point of impact. -- Chuck |
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Quoted: Remove the bolt from the bolt carrier and by hand move the carrier back and forth in the upper receiver. You should not feel any resistance of any sort when the gas tube enters the gas key on the top of the carrier. If you do remove the handguards and press the gas tube in the opposite direction from the point of impact. -- Chuck I tried it with the bolt out and there is not any of what I would call "resistance" but you can feel it when the gas tube engages the carrier. There is a sort of THUNK sound. All of the engagement surfaces are beveled so I guess it will not matter, but it still seems strange. The Gas Tube is only loose in the receiver, not at the gas block... Man, I miss the M-4s we had in the Army, MilSpec is the only way to go. Now if Sept will hurry up;) |
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You need to adjust the gas tube, you should not feel the "thunk" which will just wear out the gas tube (or the gas key) from the friction. Eventually, as the wear continues you'll lose gas pressure in the sytem. This check is commonly skipped when rebarreling a rifle, but is important. -- Chuck |
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Quoted: You need to adjust the gas tube, you should not feel the "thunk" which will just wear out the gas tube (or the gas key) from the friction. Eventually, as the wear continues you'll lose gas pressure in the sytem. This check is commonly skipped when rebarreling a rifle, but is important. -- Chuck Ok, stupid question...how exactly do you adjust the gas tube? I have a feeling that by virture of my having to ask, it is something I do not need to do myself;) |
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