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Posted: 9/17/2016 5:36:55 PM EDT
| I built my first ar recently (first ar ever as well as first build) and today my bcg arrived. It's a Midwest Industries bcg going into an Aero Precision upper. The bcg won't go into the upper, though; it gets all the way to the star chamber but then goes no further. It seems like the bolt needs to rotate a tiny bit more to the right, but it's turned as far as it will go. Anybody else dealt with this or know how to solve it? |
| Looking at it from the barrel and (no bcg and no ammo in it, it's safe), I can tell that the gas block is slightly rotated to the left. It looks like the entire barrel might be rotated a tiny bit (I'm talking millimeters), but I'd like to think aero precision would have assembled this upper to where that isn't the case. I bought the upper pre-assembled, so I don't have tools to fix this if this is the issue. I might be able to take it to my local range and see if anyone there can help. |
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Quoted:
I built my first ar recently (first ar ever as well as first build) and today my bcg arrived. It's a Midwest Industries bcg going into an Aero Precision upper. The bcg won't go into the upper, though; it gets all the way to the star chamber but then goes no further. It seems like the bolt needs to rotate a tiny bit more to the right, but it's turned as far as it will go. Anybody else dealt with this or know how to solve it? Welcome to the site. First pics, upload them to a hosting site and post them here, they won't be visible until approved by a member because of your post count. But we can see them. Did you scrub the chamber, barrel, and barrel extension well before assembling? Did you remove your firing pin from the bcg? Don't if you haven't Is the extractor facing the ejection port? Are the upper and lower together? For now remove them, we'll get there soon Is the charging handle installed? With the ch out and the bcg assembled properly and lubed, the bcg should drop in and go into battery under its own weight, if anything a gentle press with the finger to seat it fully. Still get some pics up |
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I had issues with a PSA BCG, and an Aero upper. It was chambered for 223 Wylde, and I lapped the heck out of it in order to get it to seat. It was not the upper itself, but the barrel extensioon. Putting an AR together is not rocket science, but you do have to pay attention.
I like to be nice and believe that the one they shipped me was finished at 4:59 on Friday. Making it an exception and not the rule. ETA: inspection camera showed rough edges inside the extension which was catching the bolt on extraction, and not letting it rotate. Almost looked like they did not complete finishing it. That is why I lapped it. |
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Thanks for welcome.
Here's a pic of the barrel (looking down it, it looks like the gas port isn't directly on top, which might explain the gas block--I'm not sure though because I wasn't using a bore scope or anything). http://imgur.com/HTsssCw Here's a pic of the bcg as far as it will go. Note the tooth on the left side and the slight gap above it--that gap is what it should be fitting into. http://imgur.com/7udeHPg I haven't done any scrubbing yet. I have to get a cleaning kit for this (I have one for my handgun, but it doesn't have a brush that'll fit this and this is my first rifle). I have removed the firing pin (sorry if that's bad--I'm new at this) because I disassembled the bcg (at least 3 times at this point) and made sure it was lubed properly. Looking from the barrel end, the extractor is at a ten o'clock position, so it's facing the ejection port. I took the upper off the lower to be able to move it around easier. I took the charging handle out while I'm figuring this out. |
| Based on the picture, it looks like the barrel/extension is misaligned. I have dealt with Aero's CS. They are excellent to deal with. If you don't have the means or don't want to fix their mistake, I would email/call them and show/tell them whats happening. I'm sure they will take care of you. |
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Ok so first off, it's decision time.
Your gas block is obviously incorrect so do you want to send it back or fix it yourself? If you want to give it a go . Put the f pin back in your bcg and never do that again. You can find yourself with a bcg jammed in the rifle that you can't remove. See if that block is a set screw type, if so loosen the screws and pull it and the tube forward and out of your way. Check if the barrel extension is flush on the inside of the reciever and not rotated. Insert your bcg again. It should seat, again put the firing pin back in it. See if the gas port is centered on the top of the barrel. Most likely the gas tube is making contact with the key and not letting it go forward. Plus the cam pin on your bcg is not rotating correctly due to the firing pin being removed. It's tough to see if the extension is rotated or not. Try another pic with the bcg out . When posting your pics, use the picture icon in the toolbar below the text field to paste a link |
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When I said I had removed the firing pin, I meant when it was out of the rifle--every time it's gone in the rifle it had the firing pin in place and was fully assembled.
Is it difficult to deal with the gas block? It doesn't seem to be, but I've never done it. The gas block is an aero precision low profile one with two hex head screws. |
The top picture clearly shows things are out of kilter. Gas block is off to the 1030 position,and your muzzle device looks about 11:45. But that could only mean your gas block was not lined up, and your barrel could still be straight. Same for the muzzle device. You just need to remove them to check 
Year bottom pic is taken at an angle, which makes it difficult for me to be certain if it is off, as it appears to be slightly, or if just camera angle. It does not look to be as crooked as your gas block though. If you have the proper armorers tool I would say break it down and rebuild it. Then you know it is good. Just buy, borrow, but use the right tools. I mean a upper vice block, armorers wrench, vice, etc.... It would suck for you do follow a YouTube video with shortcuts and mess up your upper. Use the guides and stickies here and you should not have a problem. |
| I would send that back. Don't try to fix it yourself. They may have sheared the index pin or it dug into the alignment slot. If you try and fix it, it may void the warranty. They should replace that quickly once they see that last pic showing the alignment of the feed ramps. |
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Quoted:
Yeah, I'm just going to send it back. I put in a support ticket that will hopefully be answered Monday. I don't want to have it screwed up any more than it already is, plus with aero doing it it should be free, whereas with a gunsmith, I'm paying for it. Did you buy that unit as an assembled upper, or did you do work on it yourself? Either way, Aero has some good people over there, and they will take good care of you. |
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Quoted:
Did you buy that unit as an assembled upper, or did you do work on it yourself? Either way, Aero has some good people over there, and they will take good care of you. Quoted:
Quoted:
Yeah, I'm just going to send it back. I put in a support ticket that will hopefully be answered Monday. I don't want to have it screwed up any more than it already is, plus with aero doing it it should be free, whereas with a gunsmith, I'm paying for it. Did you buy that unit as an assembled upper, or did you do work on it yourself? Either way, Aero has some good people over there, and they will take good care of you. Hey, I learned how to quote. Cool. Anyway, I bought it as an assembled upper. It was one of the 5.56 complete uppers they had on sale for Labor Day. |
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