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Posted: 5/21/2020 2:12:27 PM EDT
[#1]
Quoted: I recently built a lower using a PSA build kit and an Aero lower with Magpul furniture which I was trying to join to my PSA complete upper chambered in .223 wylde. However when I try and attach the upper the rear does not want to seat all the way. I tried two other uppers and neither of them will fit either all of which are .223 complete uppers that were purchased from PSA but when I try to attach them to my other lowers all three uppers fit just fine. The other lowers are a Spikes and an Anderson. I am very new to the building side of things and could have easily overlooked something simple but I find it odd that all three uppers fit the other lowers just not the Aero lower. show us a photo of your Aero lower right next to your Spikes or Anderson lower.. from several angles. will the upper seat to the lower with the BCG removed? |
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Posted: 5/21/2020 2:21:34 PM EDT
[#2]
Looks like you have your buffer tube screwed in too far.
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Posted: 5/21/2020 2:25:54 PM EDT
[#3]
Quoted: I recently built a lower using a PSA build kit and an Aero lower with Magpul furniture which I was trying to join to my PSA complete upper chambered in .223 wylde. However when I try and attach the upper the rear does not want to seat all the way. I tried two other uppers and neither of them will fit either all of which are .223 complete uppers that were purchased from PSA but when I try to attach them to my other lowers all three uppers fit just fine. The other lowers are a Spikes and an Anderson. I am very new to the building side of things and could have easily overlooked something simple but I find it odd that all three uppers fit the other lowers just not the Aero lower. Image Links: https://ibb.co/7vWTNrS https://ibb.co/vkBfbGN https://ibb.co/vLv8t9G https://ibb.co/HnyGX3W https://ibb.co/vYyjWn7      |
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Posted: 5/21/2020 2:36:51 PM EDT
[#4]
Quote HistoryAgree. |
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Posted: 5/21/2020 2:48:39 PM EDT
[#5]
Quote HistoryQuoted: Agree. Quote HistoryQuoted: Agree. good catch.. (how did he screw it in that far?) |
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Posted: 5/21/2020 4:52:02 PM EDT
[#6]
Quote HistoryQuoted: good catch.. (how did he screw it in that far?) The receiver extension he has, is U notched, and allows the tube to be over threaded in without the buffer retainer pin preventing it. |
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Posted: 5/21/2020 5:59:39 PM EDT
[#7]
Quote HistoryQuoted: The receiver extension he has, is U notched, and allows the tube to be over threaded in without the buffer retainer pin preventing it. Quote HistoryQuoted: Quoted: good catch.. (how did he screw it in that far?) The receiver extension he has, is U notched, and allows the tube to be over threaded in without the buffer retainer pin preventing it. Good catch. |
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Posted: 5/21/2020 6:15:41 PM EDT
[#8]
I took the buffer tube back one rotation and secured everything and it fits like a glove now. Thank you!
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Posted: 5/24/2020 6:47:26 PM EDT
[#9]
Well, I don’t wanna get THAT one... lol
Glad you fixed it OP |
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Posted: 5/25/2020 4:30:29 AM EDT
[#10]
Quote HistoryQuoted: Well, I don’t wanna get THAT one... lol Don't know, and in fact on some Receiver extensions, you have to face the the front of the tube to get it to just kiss the back of the buffer retaining pin for the perfect tube index instead. Take the case of the below photo, and the end of the tube is slightly too long for the correct index/buffer retainer, and in order to thread the tube one more thread in the lower receiver and just kiss the back of the pin surface, bottom edge of the tube needs to be set back a smidge.  So with the U slot tubes, if the front of the tube is just a smidge too long, it still allow the tube to be index correctly to the inside of the lower receiver tube ring face at correct length index without having to face the bottom end of the tube, and the sides of the U slot will protrude a touch more forward of the back surface of the buffer retainer pin isntead. The only glitch to this, is when you are trying to get that extra wind forward of the tube in the receiver for no reason, and the top of the tube breaks the inside line of the threaded socket isntead. |
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