Hope you all can point me in the right direction, picked up a NHM-91 all original form which I would like to convert it to a 87S. I am looking for the bipod, rpk stock, handguards and pistol grip. I have found the muzzle break already and I am not sure if I want to modify a Russian RPK stock set or look for the Chinese wood. Any help with this would greatly be appreciated since this is my first Chinese AK. Thanks!