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I don't want to add the second slot in the receivers.
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I don't think you get what i'm trying to say to you. You DON'T cut a second slot in your single-hook receiver, that's the whole point. You carefully notch the second hook on the trigger (it only takes a tiny bit) just enough so that the trigger will fit and work to JUST release the hammer, but NOT make that mile of overtravel that a standard AK trigger normally has.
It's the single best upgrade you can do to your AK trigger and costs nothing. The overtravel in an AK trigger is immense relatively speaking.
There's some more work to be done to make sure the disco works correctly, it's self-evident when you look at it and cycle the trigger, easy-peasy. (hint: disco "foot" angle)
Then if you really want performance, you start working on the take-up, which is also absurdly long in an AK. Shorten and re-profile the hooks (while still watching/adjusting disco engagement), then square the hammer to the back of the bolt if you like, but keep in mind if you do that you will almost certainly have to lower the disco shelf some as taking off part of the hammer hump may result in the bolt not pushing the hammer down far enough to engage the disco.
It's all easy as hell, and can be done with nothing more than a small file and some sandpaper. Dremel makes it fast but you have to be real careful not to have a dremel spasm and cut too much off.