The G11 K1 (K for Konfiguration) production model was completed in March 1987. Field test and troop trials began in June with the Bundeswehr in Hammelburg and lasted until January 1989. It achieved a 100% higher Ph than the G3. The final development of the ammunition was completed toward the end of 1988 with the same dimensions as 4 years earlier. In March 1989, the first "Operator´s Manual" was made for the G11 K1 for the ACR evaluation. By then work already started on the G11 K2. On March 3, 1989, the first 5 ACR units were shipped to the Aberdeen Proving Ground. In May, H&K began to instruct the testers on how to operate the weapon.