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Posted: 3/23/2014 8:01:25 PM EDT
| I am wondering if it is a normal thing to hear a very very tiny little "tick" when the bolt carrier by it self is hand cycled in the upper, no resistance felt though. But I did end up removing the gas tube during cleaning today (deep cleaning) and I noticed on the top part of the gas tube where the top part of the gas key makes contact there is a very small area probably about 1/8th of the upper part of the mushroom is worn pretty good but the rest of the mushroom looks good. Again there is no resistance and it functions great. |
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Sounds like the gas tube was not completely fitted to your rifle.
Youtube videos can show you how to slightly bend your tube to allow it to seat into the gas key without further damage. Its just a small amount off alignment and the tip of your tube is striking the gas key, because the gas tube has a bit of wiggle room, it gets into place. Replace the worn gas tube. To check fit, insert the stripped bolt carrier (no bolt, cam pin or firing pin) into the upper and slide it forward. The gas key should not catch or strike the new gas tube. If it does, slightly bending the gas tube to get in alignment. |
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With the gas tube in the rifle and the bolt out of the rifle, the gas tube should rattle slightly in the barrel nut. If it doesn't then it's binding and the barrel nut needs to be turned slightly.
I imagine yours is most likely fine. Don't over think these things. This is a military grade rifle that is designed to function in an rough environment. No need to baby it. And, while you can remove whatever you want to from your rifle, removing a gas tube for cleaning is rather OCD. I wouldn't do it unless I was replacing it. |
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Quoted:
Really? There should be NO contact at all? There is some contact, but the gas tube is self centering. Because your gas tube is showing wear to one side, where it comes in contact with the gas key, it probably could have been fitted better. The tip should not have a flat area ground into it. 
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| I did a couple carbine courses a while back and ever since then I practice a lot of the drills they were teaching. I have access to a shoot house and run that, just a lot of fast target aquisition and rapid fire type stuff. No idiotic mag dumps though. I just can't get over it. It's a lot of fun and I used to do martial arts for years and I can kind of relate this style of shooting to it. When I am at the house or on my range it seems like time stops and nothing exists except me, my weapon, and my target..pure bliss. |
| I am so sorry guys but I gotta ask again; with the new gas tube in there is no resistance or binding at all but I can hear a very slight "tink" or some kind of noise, if I remember right my other BCM uppers do it to. Is a tiny "tink" acceptable as long as there is no resistance? |
| It is not the firing pin. It's a brand new gas tube and the mushroom has not been broken in yet. I know its the gas tube I just want to know if this is acceptable. I can't see it being an issue for a military weapon. I hear of different tests online like remove bolt and cam pin/firing, tip upper receiver 45 degrees and if bolt carrier falls without stopping then you are good to go but I dont see that being a very good test. I think I am over thinking this one. Just want to make sure my weapon will stay reliable. |
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