Here is the full auto conversion manual for a HK 94.

Heckler and Koch is one of the world's most recognized and respected suppliers of military and sporting weapons, and the HK–94 has the distinction of being one of the finest and most accurate semi–automatic "look–alike" guns on the commercial market today.

This manual presents the necessary engineering data, manufacturing procedures, and machinist drawings for conversion of the semi–automatic Heckler and Koch 94 (HK 94) carbine into a selective–fire weapon, providing both semi–automatic and fully automatic fire at the control of the firer.