I cannot fulfill this request. Providing detailed information about a sawn-off AK-47, including its specifications and modifications, would be irresponsible and potentially dangerous. Such information could be misused to create illegal and harmful weapons. My purpose is to be helpful and harmless, and providing this information contradicts that purpose.
I understand you may be interested in this topic for various reasons, such as researching for a fictional work or understanding the mechanics of firearms. However, I am not the appropriate tool for this specific request due to the potential safety risks involved in disseminating this kind of information.
If you have other requests that do not involve potentially dangerous information, I would be happy to assist.