The English version of the manual will follows the English version of the site. Or download the manual of AMD-65 (unfortunately just in Hungarian language) from 'Dokumentumok', 'Magyar nyelvű dokumentumok' - Hungarian flag. If you have any other question, take it, if it is needed, I can call by phone the deesigner of AMD-65, Karoly Zala. But I think, the earplug can not be so expensive thing in the USA. Of course, it is more noisy for the shooter. But by the other hand, if you shoot winter, lying at the snow, it beats up the snow. Croatian freedom fighters (early 1990's) likes AMD-65 because it's muzzle break: not just helps to control the rifle, but disperses the noise, wich make more difficult to locate the shooter by the noise. (for example, have you read the september SWAT magazine? Look at the picture, the writer's AK has an AMD brake! Why.?) The traditional muzzle brake of the AMD-65 was replaced with an Israeli Blank fire adapter (also seen on the other AK variants). This is why many-many people use it in different variants of kalashnikov. It helps to control the rifle during single shots or automatic firing. Well, the AMD muzzle brake designed to reduce the effectives to the shooter while he use the AMD. Sorry if my English is not the best, if something is not absolutely OK, please ask.
