"The H & K 91/93 Battle Rifles manufactured by Heckler & Koch in West Germany are commercial semi-automatic versions of the military G-3 (.308 Win) and HK-33 (.223 Rem). These weapons are being used in virtually every corner of the world. This manual provides the necessary information and fully dimensioned machinist drawings to accomplish the selective fire conversion of both of these weapons. The conversion method described in this manual simulates the G-3 and HK-33 factory weapons, and can be readily performed. Each phase of the conversion is fully described, compiled with detailed photographs and illustrations. 5 1/2"" x 8 1/2"", softcover, 56 pages."