AR Sponsor
Posted: 7/22/2012 1:47:53 PM EDT
| So i just got my AR all put together and brought it to the range and loaded rounds. insert mag. rack bolt back -round chambered, squeeze trigger, boom, and the BCG doesn`t eject round. Now the bolt will disengage with charging handle but dont know if the gas tube is pinned wrong or what now it does appear to be lined up with the hole on the barrel fine. Please help. The work was done at a local gun shop dont know how well they do with AR`s but needless to say very unhappy at this moment any help will be appreciated |
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The gas port could be undersized.
The gas port could be off center. The gas block cold be misaligned. Or too far forward. The gas key on the carrier could be leaking. The buffer could be too heavy or the action spring too strong. Especially if you are firing weaker ammo. The screws holding the gas key to the carrier could be loose. The fired case extracts and ejects when you manually pull the charging handle? If so then a massively undersized chamber is not a likely problem. |
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honestly don`t know My local shop put it together which I`m prettty sure they aren`t very up to date on the AR`s so a possibility I guess didn`t know there was an upside down way I`ve shot plenty of M16`s in the marines but never assembled to the point of changing gas tubes
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Quoted:
honestly don`t know My local shop put it together which I`m prettty sure they aren`t very up to date on the AR`s so a possibility I guess didn`t know there was an upside down way I`ve shot plenty of M16`s in the marines but never assembled to the point of changing gas tubes Knock the pin out and check? |
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Quoted:
So i removed the gas tube and bingo upside down. Absolutely ridiculous you can`t get an AR assembled at a gun shop without them screwing up such an obvious part. Thank you How does a 'gun shop', or anyone for that matter, install a gas tube without forcing it in and not no that something is wrong? Glad you got it squared away. Maybe the 'gun smith' who worked on it learned something....... |
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Quoted:
the tube that was brought to them was fine they just took it upon them selves to pin it wrong and then bend it back around to fit into the receiver much more then incompetence How somebody could install it upside down is beyond me. That takes some effort. On top of that the gas tube has 1 large hole for the gas port and 1 through hole for the pin. I'm pretty sure if I gave the parts to my 12 year old SHE could figure what go where. Accidents can happen but when you are supposedly paying a professional for something you would expect that the know what the heck they are doing. Short story. I was helping a friend build an AR. I gave him the parts list and where to order from. When his barrel and gas tube came in he call the supplier and was raising hell about how the parts were loose in the box and it bent the crap out of the gas tube. I walked in at that point  . Yup, normal gas tube, He just had no idea what he was looking at or how it went together.
You probably won't get any $ back from the smith. I would be surprised if you even get an "I'm sorry". Take it as a learning experience. That is why we build them. I can put an AR together in less than 45 minutes. It takes longer to drive to and from a local 'smith out here. Only 2 specialty tools needed to assemble an AR: armors tool and vice block. You also need a vice and torque wrench but as a man you should have plenty of those in your cave  .
Sorry for the rant but I'm pissed off FOR you. You probably were soooooo pissed on your first range day with her. BTW whats her name? Semper Fi, brother. |
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your gas tube may require a little adjusting to mate properly with the gas key after being installed upside down.
I'd bug them to give me a new gas tube some ammo and... some tannerite. torque wrench, vice, action block? 
get urself a 2x4 cut some holes in it for the takedown lugs clamp that bitch to a table and get an armorers wrench. I kid I don't really recommend this but, I noticed my crap tastic gunshow upper had a loose barrel nut and was lazy the other night and this worked fine to line it up to the next hole. |
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http://www.ar15.com/archive/topic.html?b=3&f=4&t=508773
Specifically this post by Big-Bore "You have been given good advice, but this is what I would do. 1. Pull the gas block and tube off the rifle. No need to take the tube out of the gas block just yet. 2. Check the barrel port to make sure it is clear. Once in a blue moon when the port is drilled a 'cap' will be thrown into the barrel, then if the moon and planets are aligned against you, that cap can move and plug up the port and it will give you fits trying to find out what is wrong. Just take the tube off and check the barrel gas port to rule that out. Screw blowing down the barrel unless you enjoy giving your barrel BJs. Some do it seems. 3. With the gas block and tube off the rifle, blow down the gas tube. Yes, now is the time to give your gas tube a BJ. It will love you forever after this. If air flows you have it in the block correctly. No flow, you put it in upside down. Now, to reinstall the gas block correctly. 4. Take your calipers and measure the distance from the shoulder behind (action side) the gas port to the center of the gas port. Now, measure the gas block from the rear of the gas block to the center of the gas port. Subtract and this measurement is the shim you should use to space your gas block off that shoulder. I have seen them from slam up against the shoulder to .050 off. Use a set of feeler gauges to space it out correctly. If the bottom of your barrel is dimpled, that is a perfect way to align your gas block if it is a set screw . Remove the set screw that is opposite the gas block gas port and center the set screw hole over the dimple on the bottom of the barrel. Tighten the other set screw. Install the remaining set screw and you are done. If it is a clamp on, use the feeler gauge to set the spacing and tighten. Some clamp on like the DD and JP you can still visually align the hole with the dimple and clamp the other screw first. But if your barrel is not dimpled, use the feeler gauges to set the distance. 5. To find TDC (top dead center) of the gas block, use your eyes. Surely you can visually align the gas block so that the gas tube is running down the center of the barrel and the top of the gas block is at the top. You have a little wiggle room because the hole in the gas block is a LOT larger than the gas port hole in the barrel. Eye balling the gas block to TDC is more than good enough. If you do all these steps and check everything, you will find out why it was not working and it will work next time. One other thing, make sure your gas tube extends into the upper far enough to engage the gas key on the bolt, at least 1/2 to 5/8 inch minimum. It would be odd but I am sure someone has installed a CAR tube on a midlength gas system or a midlength tube on a rifle system and then wondered why it didn't work. Pay attention to the details and it will work." |
| I am plenty pissed they won`t be losing just my business I have brought them quite a bit of business which won`t be returning if the situation isn`t fixed. They have a potential AR sale tomorrow but that will fall through very quickly. And the worse part is it wasn`t just some cheap parts I bought to get an AR. Being in MA we have lovely gun laws so I got a preban Colt A2 lower with real low serial - and cerakoted to match the rest, arms folding front sight, phantom flash hider, daniel defense 16" gov`t barrel 1:7, noveske nsr rail, noveske chainsaw upper, and chrome lined bolt from a local gun manufacturer (remsport pretty good 1911 items and ar check them out) needless to say it wasn`t exactly cheap. |
| thank you everyone for all the help just finished installing the new gas tube and amazing there is air flow ( checked by deep throating barrel with spent case in chamber) now i just have to wait until saturday to shoot I have complete faith it will fire as it should and if not I`ll be back! |
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