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Some are, some aren't. The gearbox is about 5mm shorter than a standard V3 to fit into a real steel AK, so the shell isn't compatible. The piston is equally 5mm shorter and 1 tooth short to make up for this. Likewire, the sector gear also has 1 tooth less. The antireversal latch is also proprietary, as it has an external spring release mechanism, although can be replaced with a standard ARL if you don't mind losing that functionality.
That's pretty much it. Everything else internally.
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