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I'm building my first AR-15 and am having a Failure to Extract issue.
I found this thread on thehighroad.org with this description which seems to be an accurate description of what is happening:
<broken link removed>
It's a 14.5 Barrel (with pinned+welded flash hider) brand new BCG etc. Everything appears to be tight and it ejects when manually cycled.
I'm thinking it's the Buffer. I'm just using whatever came with the CAA CBST stock - but can't tell what weight of buffer it is. I don't think I have a scale that can weigh it accurately.
Any other suggestions? Should I go with the H2 Buffer and see where that gets me? Should I go straight to the H3 Buffer?
Any advice appreciated.
PB
What do you more experienced builders recommend? The H2 or the H3 Buffer.
I found this thread on thehighroad.org with this description which seems to be an accurate description of what is happening:
<broken link removed>
Failure to Extract
This is signified by a spent casing stuck in the chamber, not fully extracted from the chamber, or one spent casing and one live round being stuck in the chamber. (Sometimes one spent casing and one live round stuck in the chamber is called a double feed, but a double feed is technically 2 live rounds stuck in the chamber)
Assuming the weapon ran correctly before and is in the same configuration, this is generally an indication of a failure of the extractor. The extractor is made up of the extractor, the extractor spring, and the extractor insert.
First remove the extractor and inspect it for crack, chips or deformations. If it has any, then replace the extractor. The commercial market also has seen some MIM extractors, so if your extractor has any MIM/casting type markings then replace it. The most common wear point for the extractor is in the spring. As these spring wear out they become weak and do not have the proper tension to extract correctly. Replace the extractor spring and extractor rubber insert. Be careful to order the correct part specific to your weapon. There are stronger extractor springs on the market made to address the increased pressure that the carbine systems run under. These are recommended. Also the rubber insert you replace should be replaced with a black rubber insert. The original M16A2s had a blue insert. A stronger black insert was introduced for the cycling of the M4 and is an improvement over the blue and is good to go in both rifles and carbines. Another fix is the D-fender rings, or O-rings found on the market. Install them over your extractor spring. This was a standard upgrade for the M4A1s done by Crane Industries for SOCOM.
Now assuming you have these issues on a new built weapon, then you may need to go past the above advise and look at some other areas. Issues like this are most commonly involved on shorter barreled ARs. With a shorter barreled AR (generally 14.5, 11.5, 10.5, 10.3) you have about twice the pressure in the system with less dwell time (shorter than 14.5) and a faster unlock time. One of the issues that needs to be addressed is slowing the cycle rate of these shorter barrels. This is done in part by the addition of a tungsten weight buffer. The M4 carbine runs a H-buffer and the M4A1 carbine runs an H2 buffers. There are also H3 buffers that see some use. Also stronger recoil springs will provide some aid. If all else fails you may need to look at gas port size and confirm that the chamber is not cut too tight.
It's a 14.5 Barrel (with pinned+welded flash hider) brand new BCG etc. Everything appears to be tight and it ejects when manually cycled.
I'm thinking it's the Buffer. I'm just using whatever came with the CAA CBST stock - but can't tell what weight of buffer it is. I don't think I have a scale that can weigh it accurately.
Any other suggestions? Should I go with the H2 Buffer and see where that gets me? Should I go straight to the H3 Buffer?
Any advice appreciated.
PB
What do you more experienced builders recommend? The H2 or the H3 Buffer.