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Posted: 8/24/2015 5:41:32 PM EDT
Bought an 8.5" PSA 300blk barrel to build an upper for my Form 1 can. Well I get it today, and I noticed the gas port is misaligned. Does it look to far off to work?
In the pic, split the difference between the index pin and the markings on the barrel. When inserted into a receiver it doesn't look that bad. 
This is the one I ordered: http://palmettostatearmory.com/index.php/catalog/product/view/id/21674/s/8-5-pistol-melonite-300-blkout-bbl-1-7-300-aac-blackout-1-7-psa/category/3381/. I figured the pic was off as it doesnt have a shoulder there either..... Oh and then I noticed it says 5/16x24 threads but it is 5/8x24 Editing post because I had a messed up day and then this.... so I know i coulda worded this better... |
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Quoted: No, I assumed it would be 5/8x24... I just noticed that in the ad after the fact. I cant get a very good pic... http://i1027.photobucket.com/albums/y334/ronaldparker762/05dbfaa2-8a93-4499-8967-d0b295730ee4_zpsfmevmewo.jpg |
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The port to pin offset isn't enough of a difference to cause an issue. (The port on the gas block is MUCH larger than the barrel port to compensate for this)
I don't see any reason to worry about the shoulder either. The thread pitch thing is, as I'm sure you know, not their fault. I would have no issue using that barrel, I've assembled a couple A2 carbine/M4A1 clones with larger port/pin offset than that with no issues. (My first block 2 and my RO727) All that being said, if you want to return it for a 75 percent refund that's up to you, but I think PSA would probably just do an exchange if you wanted to trade it in and hope you get one with better port to pin aligment. |
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I can't tell anything about alignment from your picture. And there is a shoulder... Also, yes it is PSA's mistake for listing the wrong pitch, but did you really think it was going to be 5/16-24? While there technically is a shoulder, the way it is threaded, either the FH, brake, or suppressor stop short of it. I cant reach them by phone. 5 times in 2 days, on hold for over 20 minutes each time, and I figure it will be a couple more days before I receive an email so if my other parts arrive before then, I might just end up using it. |
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While there technically is a shoulder, the way it is threaded, either the FH, brake, or suppressor stop short of it. I cant reach them by phone. 5 times in 2 days, on hold for over 20 minutes each time, and I figure it will be a couple more days before I receive an email so if my other parts arrive before then, I might just end up using it. Quoted:
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I can't tell anything about alignment from your picture. And there is a shoulder... Also, yes it is PSA's mistake for listing the wrong pitch, but did you really think it was going to be 5/16-24? While there technically is a shoulder, the way it is threaded, either the FH, brake, or suppressor stop short of it. I cant reach them by phone. 5 times in 2 days, on hold for over 20 minutes each time, and I figure it will be a couple more days before I receive an email so if my other parts arrive before then, I might just end up using it. Yes, there should be an undercut to give the threads a place to run out, but many muzzle devices have a counterbore that would accommodate the threads on your muzzle. Have you tried to thread on a FH or comp? |
| The undercut on the threads is not done correctly as you mentioned but most good muzzle devices have a recess cut here and it would not effect them. The Gas port on the updating picture does look off but unlikely by enough to effect function. The hole in the gas blocks is enlarged quite a bit. |
BCG installed, gas tube as far in as it will go. gas tube rotated so it is as straight as I can get it.
I have a gas block I can try it with but I don't want to risk scratching it if they decide they will swap it out. Still no answer on the phones, 3 times today. I did get an email but they said they will pay for shipping to return my upper to them and repair it but I had to tell them twice it was a barrel, not an upper. Waiting to hear back. If it will work with the GB attached then I might just use it. Not much of a shoulder for a crush washer either. My AAC FH threads on just fine but I wont be running that with the can, it is direct thread. And as far as the gas block having a larger port, I understand that but this gas port is .102. So the wiggle room that's there with a 5.56 gas port is pretty much eaten up by this one. |
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BCG installed, gas tube as far in as it will go. gas tube rotated so it is as straight as I can get it. <a href="http://s1027.photobucket.com/user/ronaldparker762/media/20150826_140246_zps99xyuyka.jpg.html" target="_blank">http://i1027.photobucket.com/albums/y334/ronaldparker762/20150826_140246_zps99xyuyka.jpg</a> <a href="http://s1027.photobucket.com/user/ronaldparker762/media/20150826_140443_zpseaejauo9.jpg.html" target="_blank">http://i1027.photobucket.com/albums/y334/ronaldparker762/20150826_140443_zpseaejauo9.jpg</a> I have a gas block I can try it with but I don't want to risk scratching it if they decide they will swap it out. Still no answer on the phones, 3 times today. I did get an email but they said they will pay for shipping to return my upper to them and repair it but I had to tell them twice it was a barrel, not an upper. Waiting to hear back. If it will work with the GB attached then I might just use it. Not much of a shoulder for a crush washer either. My AAC FH threads on just fine but I wont be running that with the can, it is direct thread. And as far as the gas block having a larger port, I understand that but this gas port is .102. So the wiggle room that's there with a 5.56 gas port is pretty much eaten up by this one. I had the same exact issue with a 5.56 barrel from them but they assured me there was absolutely no way it could have been sent that way because of how they manufacture barrels 
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I had the same exact issue with a 5.56 barrel from them but they assured me there was absolutely no way it could have been sent that way because of how they manufacture barrels Quoted:
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BCG installed, gas tube as far in as it will go. gas tube rotated so it is as straight as I can get it. <a href="http://s1027.photobucket.com/user/ronaldparker762/media/20150826_140246_zps99xyuyka.jpg.html" target="_blank">http://i1027.photobucket.com/albums/y334/ronaldparker762/20150826_140246_zps99xyuyka.jpg</a> <a href="http://s1027.photobucket.com/user/ronaldparker762/media/20150826_140443_zpseaejauo9.jpg.html" target="_blank">http://i1027.photobucket.com/albums/y334/ronaldparker762/20150826_140443_zpseaejauo9.jpg</a> I have a gas block I can try it with but I don't want to risk scratching it if they decide they will swap it out. Still no answer on the phones, 3 times today. I did get an email but they said they will pay for shipping to return my upper to them and repair it but I had to tell them twice it was a barrel, not an upper. Waiting to hear back. If it will work with the GB attached then I might just use it. Not much of a shoulder for a crush washer either. My AAC FH threads on just fine but I wont be running that with the can, it is direct thread. And as far as the gas block having a larger port, I understand that but this gas port is .102. So the wiggle room that's there with a 5.56 gas port is pretty much eaten up by this one. I had the same exact issue with a 5.56 barrel from them but they assured me there was absolutely no way it could have been sent that way because of how they manufacture barrels What was the outcome? |
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What was the outcome? Quoted:
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BCG installed, gas tube as far in as it will go. gas tube rotated so it is as straight as I can get it. <a href="http://s1027.photobucket.com/user/ronaldparker762/media/20150826_140246_zps99xyuyka.jpg.html" target="_blank">http://i1027.photobucket.com/albums/y334/ronaldparker762/20150826_140246_zps99xyuyka.jpg</a> <a href="http://s1027.photobucket.com/user/ronaldparker762/media/20150826_140443_zpseaejauo9.jpg.html" target="_blank">http://i1027.photobucket.com/albums/y334/ronaldparker762/20150826_140443_zpseaejauo9.jpg</a> I have a gas block I can try it with but I don't want to risk scratching it if they decide they will swap it out. Still no answer on the phones, 3 times today. I did get an email but they said they will pay for shipping to return my upper to them and repair it but I had to tell them twice it was a barrel, not an upper. Waiting to hear back. If it will work with the GB attached then I might just use it. Not much of a shoulder for a crush washer either. My AAC FH threads on just fine but I wont be running that with the can, it is direct thread. And as far as the gas block having a larger port, I understand that but this gas port is .102. So the wiggle room that's there with a 5.56 gas port is pretty much eaten up by this one. I had the same exact issue with a 5.56 barrel from them but they assured me there was absolutely no way it could have been sent that way because of how they manufacture barrels What was the outcome? Nothing. They locked the thread and that was that. I didn't expect anything from them, as I was not the original purchaser. I just wanted to 1. see what they say 2. let them know about it, because it's a problem. Instead they assured myself and everyone else that it was done by either the previous owner or myself and in no way could have been done by them or the manufacturer. I likely will not purchase from them any more - which sucks, because I dumped a few thousand with them over the last couple years. I got 2 defective uppers in a row then the barrel, and rather than admitting fault they deflect as much as they can and lock the thread before I can even respond. In my OP they edited this in - Edit by PSA: Thank you for your comments. Unfortunately, we cannot certify what has happened to an upper after it has left us. The AR15 community, as a whole, likes to tinker. We can speculate as to what might have happened, but we have no way to know with certainty. The barrel porting process works like this: The barrel extension is torqued, index pin installed, and then gas port is drilled using the index pin as reference. The only way for the gas port to not be in alignment is if the barrel extension was untorqued. This can happen when removing a flash hider if the barrel is not properly clamped. The muzzle looks like it has a weird carbon buildup, or that it has been modified. The modified muzzle and untorqued barrel nut point towards an improper flash hider removal. I don't even know wtf they meant there. |
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OP...send that thing back to PSA. If they pay to ship it back, replace it, and return a new one to me, then I definitely will. And if they don't I will raise holy hell. If I screwed it up then that's one thing but I didn't drill the hole. I shouldn't have to pay 15 bucks to send it to them for their screw up only to wait again. PSA does make some quality stuff and up till this point I've never had an issue with them. If they make this right then cool I slid the gas block w tube on to check the alignment. How I do that is to plug the chamber, blow into the muzzle and rotate the GB until the most air comes out. This is what I get: 
Also, it will not chamber a round. This is as closed as the bolt gets.... 
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Once, several years ago I had an issue with a barrel from one of the most prestigious makers you see on this forum, couldn't ever get it resolved, despite multiple phone calls, shipping it to them, and they refused delivery, and so forth.
So I told my buddies about it, cut the barrel up with the grinder and simply swore to never ever buy or recommend them ever again. I don't know if they lost much business or not, but you got to believe in the power of the consumer. I never posted about it, but they did lose my business and that of at least a few other consumers I know for a fact. Your money is as good as anyone's, if they don't care about it they have a serious problem and it will sort itself out. Take comfort in that. And no it don't look that bad, but it should look perfect. And if the threads are wrong, well that kind of says it all! |
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Once, several years ago I had an issue with a barrel from one of the most prestigious makers you see on this forum, couldn't ever get it resolved, despite multiple phone calls, shipping it to them, and they refused delivery, and so forth. So I told my buddies about it, cut the barrel up with the grinder and simply swore to never ever buy or recommend them ever again. I don't know if they lost much business or not, but you got to believe in the power of the consumer. I never posted about it, but they did lose my business and that of at least a few other consumers I know for a fact. Your money is as good as anyone's, if they don't care about it they have a serious problem and it will sort itself out. Take comfort in that. And no it don't look that bad, but it should look perfect. And if the threads are wrong, well that kind of says it all! I have been in the same boat. I had an issue with a Tier1 barrel. Had a small gouge in the chamber and it would scratch shells. Sent it back and was told it was fine. Sold it with their assurance that it was fine and the new owner had to clean it up before he could use it. Before that, the same companie's CEO responded to me personally about a barrel that had a bad front sight that was leaking from the factory because it was machined crooked. Took care of me like that but after the last issue, it kinda sours me towards them cause they make some of the best parts out there. Everyone has bad days and I get it so if they send me a good barrel then it will be all good. If I get another lemon, which I am concerned slightly, then I will deal with it then but right now they have the benefit of the doubt. It could have been a Monday or Friday barrel. |
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Over the years I have pretty much gotten rid of the barrels that aren't MK262 friendly, except for my 18" MRP barrel.
It pretty much doesn't like anything over 69gr for some reason, even though it's a early model 1/8 twist. Maybe that's why. Shoots great with 55-69gr ammo, however. Now my 16" MRP 1/7 SS barrel is one of the best I have ever had. On par with my Krieger Recon and SPR. |
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Considering how the barrel assembly should be fixtured for drilling the index pin and gas port it is hard to imagine how they could miss.
Since you don’t show a picture of how the BE is clocked in the upper it is impossible to tell if your bolt will not close because the BE is mis-clocked or possibly something else. |
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Looks like your gas tube/gas key engagement is so bad that the gas key hangs up on the gas tube, due to the miss aligned gas block.
Blowing air through your gas system to align an gas block must be one of the most inaccurate ways to align an gas block. Making accurate markings is the way to go. |
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Looks like your gas tube/gas key engagement is so bad that the gas key hangs up on the gas tube, due to the miss aligned gas block. Blowing air through your gas system to align an gas block must be one of the most inaccurate ways to align an gas block. Making accurate markings is the way to go. I understand that but it is not inaccurate at all. Blowing through the gas system seems to work great. As the gas port comes into alignment, the volume of air through the tube increases therefore the sound of the air increases. I have found that for me, it works just as good as marking the location on the barrel and marking the gas block. I have always been able to match marks to my way. Plus I did not want to put any marks on this barrel since it was going back and the gas port on this particular barrel was quite large already so if by chance I didn't mark the gas block or barrel dead center of the port, I would have surely blocked part of the port. |
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