- Military Armament Corporation proudly introduces the MAC-5 series, a roller-delayed blowback pistol in 9MM inspired by one of the most iconic firearms of the modern era. Built using modern tooling and original HK® specifications, the MAC-5 offers an authentic shooting experience at an accessible price. Compatible with HK® and most aftermarket MP5 parts, it’s designed for versatility and customization. With MAC-branded accessories on the horizon, the MAC-5 is a perfect choice for enthusiasts seeking classic performance with modern reliability.