Been selling KS-47's and I know they have issues with mags and extractors, but didn't know to what extent.
Sold a 10.5" to my buddy last week. Went out back to shoot it, to test magazine fitments and the extractor broke on the 2nd mag....

My question is, are there any after market bolts/extractors that have resolved this issue? I love the idea of the KS-47, but if it can't even be semi-reliable, then its nothing more than an expensive toy.

I've heard people talking about removing the o-ring, which will extend the life, but how much? Less than 60 rounds in on an extractor is a bit concerning. So much that I sold the one I had bought for myself.

I use an LMT enhanced bolt in mine

I've added weight to carriers which increases the lock time.
http://www.c3junkie.com/?page_id=185
I also run an LMT enhanced bolt....as well as others.  The extractor on one of my LMT's also broke.  I contacted LMT and was told they have NO spares....and they use that proprietary lobster tail extractor.  They did have spare 6.8 Extractors which they told me would NOT work but ordered a couple anyways and reshaped one to work with my LMT 7.62x39 ACB which had the broken extractor and was able to get it to work.

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Having the broken proprietary extractor on the LMT prompted me to add weight to the carrier as mentioned above and to also use 'standard' 7.62x39 bolts which have more readily available extractors.
I also bought some of the KAK tungsten carrier weights as well.
Attached File


Lastly, I've been doing some testing with the Surefire OBC carrier which has the spring loaded carrier weight and the modified cam pin geometry that keeps the bolt locked longer should also reduce bolt and extractor breakage.
Attached File

I've already got a replacement coming free of charge. Was just looking for suggestions on how to make it last a little longer. I completely understand the limitations with the design but still love the idea.
I see people who can get 1000 rounds out of an extractor, while others get less than 100.

Thanks for the amazing customer support, you guys rock as always.

Excuse me if I missed it.  

Why were there problems to begin with?