Don't know about there AK's but I have worked on an RPK before. Horrible gun, you pay a premium price got a gun with internals that are worse then a Cyma. Externals were loose and required shims, design was poor and so was the choice of materials. Then the cherry on the cake is that they put off spec parts into the gun. In the RPK both the nozzle length and cylinder head were proprietary.
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