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Posted: 9/12/2016 10:46:29 AM EDT
[#1]
Your terminology is all screwed up, but I get the gist...
Should have fired without the buffer being contained. Next your bcg is suspect or ammo. What kind of ammo. |
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Posted: 9/12/2016 10:58:02 AM EDT
[#2]
The ammo was Federal AE 223 in the black box. Next time out I bring a proven BCG and upper and see what happens. However that BCG should be good from AIM surplus. Nevertheless I'll take it apart
and see what it looks like. |
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Posted: 9/12/2016 1:06:21 PM EDT
[#3]
The receiver extension gets thread into the lower receiver until the lip of it kisses the center of the buffer retaining pin.
In some cases, the bottom lip has to be faced back if you find that one wind back does not have the end of the tube kissing the post, while one wind more in will have the end of the tube lip binding on the center pin isntead. As for new upper, start with cleaning it correctly, including using a chamber brush with CLP by hand to clean the chamber. On the new B/C, pull the bolt off it, and with the carrier with carrier key only, dry fit it into the upper receiver. the key should not be binding on the upper slot.U channel in the charging handle, and when the front of the carrier gets about a inch from touching the back of the barrel extension, the gas tube will enter the carrier key so you can check the alignment of the two. If the gas tube needs to be re-indexed, then do so on the tube at the middle of the barrel. Hence when the gas tube is correctly indexed with the key, should be able to slide the carrier all the way forward tight against the barrel extension (part that has the feed ramps), tilt the muzzle up, and with the every so light of a shake, the carrier should slide all the way back. on the Bolt, pull the extractor and if you find a O ring around the extractor spring, removed it for safe keeping. Hence new extractor spring and O ring will put too much tension on the extractor, the extractor will not climb over the case rim correctly at loading, and will keep the bolt from locking up correctly. With the B/C cleaned and back together, hook a spend case on the extractor and cam the ejector into it bolt face channel a few times. The extractor should be under a lot of spring tension, but it should not be binding up in it channel at all as it being forced in and allow to spring back out. Lastly, when you charge the rifle, do not walk the charging handle forward!!!! The B/C needs to run full speed from the rear to allow it to strip the round and lock the bolt up correctly. Hence bolt is locked up correctly with the face of the carrier is tight against the face of the barrel extension. |
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Posted: 9/12/2016 7:54:27 PM EDT
[#4]
Quote HistoryQuoted:
the carrier should slide all the way back. on the Bolt, pull the extractor and if you find a O ring around the extractor spring, removed it for safe keeping. Hence new extractor spring and O ring will put too much tension on the extractor, the extractor will not climb over the case rim correctly at loading, and will keep the bolt from locking up correctly. With the B/C cleaned and back together, hook a spend case on the extractor and cam the ejector into it bolt face channel a few times. The extractor should be under a lot of spring tension, but it should not be binding up in it channel at all as it being forced in and allow to spring back out. Something I never thought of. Since all PSA uppers are test fired before they are shipped I'm really thinking the BCG is somehow at fault here. I'll take a close look at this aspect, and of course I will have a tried and true BCG with me next trip even if I don't get a chance to clean it. Lesson learned here on new stuff and my 40 minute trip to the WMA range... bring backups even if you leave them in the car. Nothing like a trip to the range only to have to drive home with nothing but the sound of "click" ringing in your ears 
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Posted: 9/12/2016 8:39:36 PM EDT
[#5]
Ah, the most terrifying sound on Earth, a click when you expect a bang. OP, did the primer show any strikemark at all? Ie: light strike vs no strike?
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Posted: 9/13/2016 10:00:52 PM EDT
[#6]
Quote HistoryQuoted:
Ah, the most terrifying sound on Earth, a click when you expect a bang. OP, did the primer show any strikemark at all? Ie: light strike vs no strike? VERY good question.....and in our daily grind we should all make things this simple and be this smart! But no these rounds do not look like even a fairy kissed them. I've got to look at this upper/BCG combo and some snap caps and soon at the range w/ proven upper/bcg and swaps. This will tighten the noose. |
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Posted: 9/14/2016 1:39:21 PM EDT
[#7]
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Posted: 9/15/2016 9:03:47 PM EDT
[#8]
My bet is the firing pin is not properly retained in the BCG by the retainer pin. When you (or the factory) assembled the BCG did you make sure the firing pin was forward so it would be contained by the retainer pin? Easy check - when the BCG is out of the upper does the firing pin fall out the back?
It could also be a buggered up firing pin. Good hammer action and light / no mark on the primer leads me to firing pin issue. |
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Posted: 9/18/2016 11:14:40 AM EDT
[#9]
Think I may have figured out what went wrong. I when I removed the clevis pin occupying the take down I somehow got the buffer detent wedged either by tension of the spring or the buffer tube screwed into the side of it in a raised
position This would limit the forward travel of the buffer spring by about 1 to 1.5 mm. "Click". |
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Posted: 9/20/2016 7:03:27 AM EDT
[#10]
Quoted:
But it sure has me wondering how this could cause the weapon not to fire. If anything the spring would be allowed to move further forward than were it rests but unless I'm missing something this should not cause the weapon to not fire. Am I correct ? . Where was the missing detent at? In the carrier, blocking the firing pin from going forward? Down in the FCG keeping the hammer from moving with full force, or getting fully forward? |
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Posted: 9/27/2016 8:50:40 PM EDT
[#11]
The detent only went missing after the take down pin was removed and the upper pivoted on its pivot pin. Then the detent flew out and the spring came forward and out. While in the upper it was not compressed and held down by its shoulder by the buffer tube screwed over it slightly (as it should be) but rather the buffer tube was screwed into the side of it in an elevated position with compression thereby locking it. This prevented the buffer/spring assembly from moving all the way forward during a charge.
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