Chinese Type 63 select fire rifle. It’s chambered in 7.62x39 and fed from proprietary detachable 20 round mags
American made RPG, the PSRL-1 and PSRL-2, Produced by AirTronic USA. It was designed for export and US allied countries that are more familiar with Soviet equipment. It has seen use in Ukraine and was adopted by the Peruvian Army.
Circa 1969 Smith & Wesson QSPR (Quiet Special Purpose Revolver). A S&W Model 29 .44 Magnum that was chambered for a low powered shot shell filled with 15 tungsten balls in a plastic sabot. The barrel was smooth bore and didn’t require a suppressor because the shot shell contained so little powder. Just 75 were produced and were withdrawn from Army use quickly, but they were supposedly still used by SOG in black ops late in the Vietnam War.