 The Hua Dong Industrial Academy’s Mechanical Research Institute, a state-controlled civilian organization that carried out China's AGL development, concluded that such foreign weapons were too large and heavy to be man-portable and did not fit within doctrinal deployment plans for the system.They also had problems with each side's ammunition; the U.S. grenade's advanced primer ignition (API) operating principle was less reliable than desired, and the Soviet grenade was too small to contain an effective high-explosive anti-tank (HEAT) warhead, so the team compromised on a 35 mm cartridge.After five generations of prototypes, the team created a design designated the W87.