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Posted: 1/30/2021 9:52:02 PM EDT
Put together an AR 15 in 223 recently. 18” barrel, no adjustable gas block, standard bcg. Reliable as hell but noticed some markings on front of ejection port. From the start it ejected at about 2oclock at best. But it didn’t really care as it ran great. Wasn’t until saw this marking that I decided to troubleshoot. In the picture you can see the bare metal showing on front edge of ejection port as well as the back edge of hand guard. I have attached a link to a slow motion video I’ve uploaded onto YouTube. This is the gun ejecting a round, I rewind it a few times.
It seems the brass slams back into the deflector, bounces straight forward off that into the front of ejection port and or back of hand guard causing the marks. Only thing I have tried was a heavier H2 buffer. It did not really make a difference. Any advice would be greatly appreciated.  Brass ejection |
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Posted: 1/30/2021 10:59:53 PM EDT
[#1]
Your pics appear to require a login, so you posted a private view, not a public link.
The video shows your brass bouncing hard off the bolt face, so check your ejector. It's probably binding, because it should be flinging the brass out, not allowing it to stick to the bolt face until it's jarred off when the bolt bounces off the buffer at the back of its counter battery stroke. Your youtube link is malformed - made hot below. Brass ejection |
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Posted: 1/31/2021 2:13:15 AM EDT
[#2]
Install an extractor O-ring. If there’s already one, replace it. |
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Posted: 1/31/2021 5:28:07 AM EDT
[#3]
Start off with a full pull of the charging handle, and make sure that the face of the bolt stops 1/8"~1/4" in front of the back edge of the ejection port.
If bolt is flush with back edge of ejection port, or behind it, something is off with the receiver extension (such as not threaded enough into the receiver to just kiss the center pin of the buffer retainer when locked down), or buffer it too short instead. If receiver extension is installed correctly/buffer and spring the correct length, the pull the buffer and spring, and drop quarters down the tube as end spacers, until you do have the bolt stopping at the correct distance in front of the back edge of buffer port. Next with bolt in hand, hook a spent case on the extractor, and cam the ejector into it bolt face channel a few times to make sure that the ejector pin is not binding in the bolt face channel, and has good spring pressure to it. We can get into extractor clean up, as well as if the extractor spring is shite and such, but for now, pull the extractor and install a #60 O ring around the extractor spring, and reinstall the extractor. Last one where, make sure to clean the chamber with CLP and a chamber brush, get the bore and chamber dry, and then not only give the rest of the rifle a good CLP cleaning, but once that fouled CLP is removed, that the upper bearing areas of the rifle a giving a good CLP lubing as well. Hence can't tell if the spent case is being dropped by the bolt (extractor) on pull and the reason that is not pivoting off the bolt face at rear stall cleanly out the ejector port, or if the problem is the spent case is still intake to the back of stroke stall, but the bolt face is retracting back past the back edge of ejection window, and when its trying to pivot off the bolt at rear stall, tagging the ejection port back edge isntead. |
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Posted: 2/1/2021 2:33:06 PM EDT
[#4]
Quote HistoryQuoted: Install an extractor O-ring. If there’s already one, replace it. No, to the o-ring. If you need and extractor spring, get a proper extractor spring. 
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Posted: 2/1/2021 6:04:21 PM EDT
[#5]
@lysanderxiii - Where might one find such an extractor spring?
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Posted: 2/1/2021 7:48:48 PM EDT
[#6]
Go to this forums "Industry" section and look at the various companies listed.
Some of them will have the late copper colored extractor spring for sale. https://www.ar15.com/forums/industry/ |
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Posted: 2/1/2021 8:16:12 PM EDT
[#7]
Gold with black insert, is a Colt brand, M4 extra tension disconnector spring, and you don not add an extra O ring to it.
https://www.brownells.com/rifle-parts/bolt-parts/extractor-parts/extractor-springs/ar15a4-extractor-spring-assembly-prod4840.aspx |
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