Machine guns The production of serial light machine guns RPL-20 of 5.45 mm caliber may begin this year, said the general director of the concern, Alan Lushnikov. "We are focused on working on [caliber] 5.45. We need to bring to mass production. I expect this to happen this year," he said. The demand for RPL is high, including from foreign customers for the 7.62 mm caliber, but currently the concern is primarily focused on bringing the 5.