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Posted: 8/6/2016 10:28:46 PM EDT
[#1]
Apply a generous amount of lubricant to the bolt and carrier, then try again.
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Posted: 8/6/2016 10:45:45 PM EDT
[#2]
Who built the upper? PSA had a few slip out with the wrong gas tubes, preventing the BCG from fully seating.
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Posted: 8/7/2016 7:59:27 AM EDT
[#3]
The gas tube was not correctly seated in the FSB/gas block channel, and would dare to guess that the roll pin that is supposed to go through the side channel in the gas tube, is now in front of the tube in the FSB instead. If the roll pin is through it channel in the gas block, the the something is screwed up, since the end of the gas tube is way to far back in the upper receiver. Hence either gas tube is out of spec, or something strange is going on with the barrel shoulder for the gas block/FSB to cause the end of the gas tube to be that far back in the upper receiver.
Hence the sealing band of the gas tube should be about center of the radius cut for the key in the upper receiver. 
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Posted: 8/7/2016 8:11:27 AM EDT
[#4]
remove gas tube, check for function
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Posted: 8/7/2016 9:37:33 AM EDT
[#5]
Quote HistoryQuoted:
Who built the upper? PSA had a few slip out with the wrong gas tubes, preventing the BCG from fully seating. Quote HistoryQuoted:
Who built the upper? PSA had a few slip out with the wrong gas tubes, preventing the BCG from fully seating. Radical Firearms near Houston, TX. I live about 40 minutes away and the price seemed pretty reasonable. I hope that wasn't the case. Thanks for the heads up! Quoted:
The gas tube was not correctly seated in the FSB/gas block channel, and would dare to guess that the roll pin that is supposed to go through the side channel in the gas tube, is now in front of the tube in the FSB instead. If the roll pin is through it channel in the gas block, the the something is screwed up, since the end of the gas tube is way to far back in the upper receiver. Hence either gas tube is out of spec, or something strange is going on with the barrel shoulder for the gas block/FSB to cause the end of the gas tube to be that far back in the upper receiver. Hence the sealing band of the gas tube should be about center of the radius cut for the key in the upper receiver. http://xpnphg.blu.livefilestore.com/y1px_51vblgRSTdsrPM2QG1K66JkBdG8C3xNqWm2tUAqWZ3HmA-xAP0LbzYMPu6X6U2GuBplSJDFdF2FiKL6d8uLPh0rQPPcd3V/DSC_5315.jpg http://i817.photobucket.com/albums/zz98/68SS2/firearms/126_0590.jpg Oh wow. Thank you for the pictures and diagnosis! I'm going to give Radical a call tomorrow just because it is brand new and go from there. In the mean time I'll do some more research and see how difficult it is to resolve the issue myself. Thank you again! |
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Posted: 8/7/2016 9:38:29 AM EDT
[#6]
Quoted:
remove gas tube, check for function I'll have to see how to do that. Thank you for the tip! Quoted:
Apply a generous amount of lubricant to the bolt and carrier, then try again. Thanks for the tip, I'll be sure to try that once I get the gas tube straightened out. |
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Posted: 8/7/2016 1:31:26 PM EDT
[#7]
theres a small roll pin in the gas block that retains the gas tube
drive it out with a finishing nail (or a small punch) you should then be able to slide the tube back towards the reciever, rotate it and slide it out the front of the reciever |
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Posted: 8/7/2016 5:58:17 PM EDT
[#8]
Pull the bolt out (forward). Your picture shows it in the retracted state.
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Posted: 8/8/2016 1:48:20 PM EDT
[#9]
Quote HistoryQuoted:
theres a small roll pin in the gas block that retains the gas tube drive it out with a finishing nail (or a small punch) you should then be able to slide the tube back towards the reciever, rotate it and slide it out the front of the reciever Quote HistoryQuoted:
theres a small roll pin in the gas block that retains the gas tube drive it out with a finishing nail (or a small punch) you should then be able to slide the tube back towards the reciever, rotate it and slide it out the front of the reciever Thanks for the guidance and instructions Doc Zox. I've emailed RF along with the link to this thread so they can take a gander at all of the pictures. I'm definitely not against doing the work myself once I've become a bit more familiar with the system but I may have to pick up some more tools that are meant for working on ARs. Thank you again! Quoted:
Pull the bolt out (forward). Your picture shows it in the retracted state. I did have the bolt extended when trying to insert it into the receiver. You're right though, a couple pics do have the bolt retracted but a couple do have it extended as well. I did that just in case something could be spotted malfunctioning in one of it's two states. I do appreciate the troubleshooting though. Thanks! |
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Posted: 8/10/2016 9:38:07 PM EDT
[#10]
I ran the upper over to Radical Firearms this afternoon and they took a look at it and agreed it was the gas tube. So, 20 minutes later I was out the door with everything functioning as it should.
Thanks to all! There are some great and knowledgeable members on this site! |
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Posted: 8/11/2016 11:29:26 AM EDT
[#11]
Was it a bad gas tube or was it installed incorrectly?
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Posted: 8/12/2016 11:09:06 AM EDT
[#12]
Quote HistoryQuoted:
Was it a bad gas tube or was it installed incorrectly? I think he said it was just installed incorrectly. |
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Posted: 8/12/2016 11:28:12 AM EDT
[#13]
does it now seat with less tube inside the receiver?
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Posted: 8/13/2016 1:51:47 PM EDT
[#14]
Quote HistoryQuoted:
does it now seat with less tube inside the receiver? Yes. It's good to go. Thanks for all of your help! |
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Posted: 8/14/2016 6:09:05 PM EDT
[#15]
Quote HistoryQuoted:
I ran the upper over to Radical Firearms this afternoon and they took a look at it and agreed it was the gas tube. So, 20 minutes later I was out the door with everything functioning as it should. Thanks to all! There are some great and knowledgeable members on this site! It's good they took care of the issue. |
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Posted: 8/18/2016 2:43:20 PM EDT
[#16]
I bought 2 of there gas tube and neither, wouldn't fit in the gas key,primary arms took care of it
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Posted: 8/22/2016 4:57:04 AM EDT
[#17]
Can you post a picture of what your gas tube looks like now that they fixed it....I have a post on here where I am having some of the same problems with my NEW Radical Arms upper...
My post is " Gouges in my new Upper " ...and I explain everything that was happening....sounds a lot like what happened to you.... I f you could post some pics I would appreciate it ... Thanks |
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Posted: 9/28/2016 3:58:33 PM EDT
[#19]
About the time the op opened this thread I assembled an upper and set it aside waiting for rail and bcg. When I installed the bcg I noticed it stopped about 1/16" short of fully seating. Having read this thread I removed the bcg and checked where the gas tube ended, sure enough it looked like the picture in the op's opening post. Thinking back the pin was very tight fit in the gas block requiring several more strikes than usual to start. Thanks!
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