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Discussion Starter · #1 ·
I was able to get to the range for a little while today. I put another 90 rounds through the RDB.

I was not having any observed problems with the extractor on my RDB before but I still added an AR-15 Extractor Spring upgrade Kit (minus the 0o-ring) before I went to the range. It appears that the extractor pin did not move at all after the 90 rounds fired today.

Damn that gun is fun to shoot! I was getting 3 shot clover leafs using the Tavor 25 yard sight-in target.
 

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I was able to get to the range for a little while today. I put another 90 rounds through the RDB.

I was not having any observed problems with the extractor on my RDB before but I still added an AR-15 Extractor Spring upgrade Kit (minus the 0o-ring) before I went to the range. It appears that the extractor pin did not move at all after the 90 rounds fired today.

Damn that gun is fun to shoot! I was getting 3 shot clover leafs using the Tavor 25 yard sight-in target.
How "stiff" (difficult to push out) is that pin after the upgrade? Did your original pin slide pretty freely?

I have not had any pin issues myself (around 800rds now), but I've got a "BCM extractor spring upgrade kit 3-pack" in the mail (for other reasons initially) so I may throw one of them in the RDB for good measure.
 

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Discussion Starter · #3 ·
How "stiff" (difficult to slide out) is that pin after the upgrade?

I have not had any pin issues in the last 800rds through mine, but I've got a "BCM extractor spring upgrade kit 3-pack" in the mail (for other reasons initially) so I may throw one of them in the RDB for good measure.
I would put it in. Cheap insurance. i cannot move the pin unless I depress the extractor into the bolt. I had to use a pair of pliers to depress the extractor to install the pin after I used the upgrade kit. I did not use the o-ring, just the spring and the buffer. I'm not sure there is room enough for the o-ring.
 

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I would put it in. Cheap insurance.
So I ended up installing one. While my extractor axis pin did exhibit some "retention" (i.e. it wouldn't just slip out on its own and did require some pushing) and has showed no signs of walking after 800~ rounds, the difference after the upgraded spring is quite noticeable.

That puppy is in there now. Cheap insurance for sure.
 

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Discussion Starter · #7 ·
That's what I did. It seems plenty tight and strong without the o-ring. The stronger spring and buffer does several things. It provides more force to keep the pin in place. The extractor will grip the shell casing better to give better extraction and reduce the chance of jams. The extractor will hold onto the casing better to allow the ejector to throw the case out of the gun cleanly.

Lefty, I know you know about this and this is for those who may wonder why the change was done.
 

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Discussion Starter · #8 ·
So, I checked again and I found that there was enough room in the RDB for the o-ring. I put it in. As a side note: I also put an AR15 Extractor Upgrade Kit in my Tavor X-95 bolt. The kit also fit that rifle.
 

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My extractor didn't seem super loose, but still looser than my AR. I had an extra O ring from a domain kit, so I slapped that in the RDB and that alone tightened it up a decent amount
 

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Two days ago I created a ticket at the Kel Tec site telling them that my extractor axis pin is loose. They responded today: "Yes, there's a thicker one now. Please provide your name and address for it."
 

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Here is an interesting picture showing how the ar15 bolt keeps the extractor pin from moving by utilizing the carrier. I wish the rdb could have done something similar


seems like others have implemented a fail safe as well...fs2000 bolt. see the stopper that protrudes...



hell even kel-tec's su16 bolt doesn't protrude enough to expose the extractor pin.

 
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